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Key synonyms
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(Medicine) Of, relating to, or being a condition or a disease whose cause is unknown:
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  1. (Medicine) Of, relating to, or being a condition or a disease whose cause is unknown:
  2. (Biochemistry) Being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet:
  3. Fundamentally important or necessary:
Meaning a great deal; having much significance, consequence, or value
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  1. Meaning a great deal; having much significance, consequence, or value
  2. Having high social rank or influence; prominent:
  3. Having or suggesting a consciousness of high position or authority; authoritative:
Highest, as in rank or office; foremost
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  1. Highest, as in rank or office; foremost
  2. Highest in rank, authority, or office:
  3. Most important or influential:
Of, relating to, or serving as a pivot.
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  1. Of, relating to, or serving as a pivot.
  2. On which something turns or depends; central, crucial, critical, etc.
  3. Being of crucial importance; central, key.
A key for drawing back or unfastening the latch of a door, esp. of an outer door, from the outside
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  1. A key for drawing back or unfastening the latch of a door, esp. of an outer door, from the outside
  2. A key for opening a latch or lock, especially one on an outside door.
A person or thing that opens
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  1. A person or thing that opens
  2. (Poker) Cards of sufficient value to allow a player to open the betting
  3. One that opens, especially a device used to cut open cans or pry up bottle caps.
A key designed to open a set of several locks; a passkey
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  1. A key designed to open a set of several locks; a passkey
  2. A key that will open every one of a set of locks
Any private key
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  1. Any private key
  2. An electronic password.
  3. A key, especially in a hotel, that allows someone in authority to open any door
A key with a large portion of the bit filed away so that it can open different locks.
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  1. A key with a large portion of the bit filed away so that it can open different locks.
  2. A key having a large part of the bit filed away so that it can be used to open any of various simple locks
  3. A very simple design of key that usually has a cylindrical shaft (sometimes called a "shank") and a single, minimal flat, rectangular tooth or "bit".
Something markedly similar to another of the same class:
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  1. Something markedly similar to another of the same class:
  2. To respond to a pleading, discovery request, or other judicial process or procedural step. To respond to a pleading, discovery request, or other judicial process or procedural step. To address or counter allegations, account for one’s actions, or otherwise put up a defense. To assume the liability or responsibility for another’s actions. To pay a debt or other liability; to suffer the consequences for one’s actions. A pleading that is a defendant’s principal response to a plaintiff’s complaint. It denies, admits, or otherwise addresses each of the allegations in the complaint. It also usually sets forth the defendant’s affirmative defenses and counterclaims. See also reply.
  3. A solution, as to a problem.
A mutual defining of terms, declaration of motives, etc. to clear up a misunderstanding or settle a dispute
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  1. A mutual defining of terms, declaration of motives, etc. to clear up a misunderstanding or settle a dispute
  2. The interpretation, meaning, or sense given in explaining
  3. The act or process of explaining:
The answer to a problem
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  1. The answer to a problem
  2. The answer to a problem or the explanation for something:
  3. A method or process of dealing with a problem:
Something that serves to guide or direct in the solution of a problem or mystery.
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  1. Something that serves to guide or direct in the solution of a problem or mystery.
A character (☛) used in printing to call attention to a particular paragraph or section.
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  1. A character (☛) used in printing to call attention to a particular paragraph or section.
  2. An alphabetized list of names, places, and subjects treated in a printed work, giving the page or pages on which each item is mentioned.
  3. (--- Mathematics) A number or symbol, often written as a subscript or superscript to a mathematical expression, that indicates an operation to be performed, an ordering relation, or a use of the associated expression.
(Computers) A variable that holds the address of a core storage location.
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  1. (Computers) A variable that holds the address of a core storage location.
  2. (In combinations) Something worth a given number of points.
  3. (Computers) A symbol appearing on a display screen in a GUI that lets the user select a command by clicking with a pointing device or pressing the enter key when the pointer symbol is positioned on the appropriate button or icon.
(Roller derby) A player in with responsibility for co-ordinating their team in a particular jam.
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  1. (Roller derby) A player in with responsibility for co-ordinating their team in a particular jam.
  2. A person or thing on or around which something turns or depends, etc.; central point
  3. (Basketball) A position taken by an offensive player usually facing away from the basket near the foul line to relay passes, attempt a shot, or set screens.
A point or circumstance on which subsequent events depend.
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  1. A point or circumstance on which subsequent events depend.
  2. Anything on which matters turn or depend; cardinal point or principle; pivot
  3. A small folded paper rectangle gummed on one side, used especially to fasten stamps in an album.
The basic, central, or critical point or feature:
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  1. The basic, central, or critical point or feature:
  2. A difficult problem; puzzling thing
  3. A puzzling or apparently insoluble problem.
A means of exerting influence, pressure, etc.
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  1. A means of exerting influence, pressure, etc.
  2. The support or point of support on which a lever turns in raising or moving something
  3. The point or support on which a lever turns. The position of the fulcrum, relative to the positions of the load and effort, determines the type of lever.
A means to an end
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  1. A means to an end
  2. A means of accomplishing; a tool:
  3. A simple machine consisting of a bar that pivots on a fixed support, or fulcrum , and is used to transmit torque . A force applied by pushing down on one end of the lever results in a force pushing up at the other end. If the fulcrum is not positioned in the middle of the lever, then the force applied to one end will not yield the same force on the other, since the torque must be the same on either side of the fulcrum. Levers, like gears, can thus be used to increase the force available from a mechanical power source.
A center or focal point
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  1. A center or focal point
  2. The group or series so connected
  3. A means of connection; a link or tie:
(Geology) The central portion of the earth below the mantle, beginning at a depth of about 2,900 kilometers (1,800 miles) and probably consisting of iron and nickel. It is made up of a liquid outer core and a solid inner core.
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  1. (Geology) The central portion of the earth below the mantle, beginning at a depth of about 2,900 kilometers (1,800 miles) and probably consisting of iron and nickel. It is made up of a liquid outer core and a solid inner core.
  2. A piece of magnetizable material, such as a rod of soft iron, that is placed inside an electrical coil or transformer to intensify and provide a path for the magnetic field produced by the current running through the wire windings.
  3. A stone from which one or more flakes have been removed, serving as a tool in itself or as a source of flakes from which other tools could be fashioned. Stones used as cores include flint, chert, and obsidian.
The source, origin, or cause of an action, quality, condition, etc.
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  1. The source, origin, or cause of an action, quality, condition, etc.
  2. (Linguis.) The fundamental element of a word or form, exclusive of all affixes and inflectional phonetic changes
  3. A plant part that usually grows underground, secures the plant in place, absorbs minerals and water, and stores food manufactured by leaves and other plant parts. Roots grow in a root system. Eudicots and magnoliids have a central, longer, and larger taproot with many narrower lateral roots branching off, while monocots have a mass of threadlike fibrous roots , which are roughly the same length and remain close to the surface of the soil. In vascular plants, roots usually consist of a central cylinder of vascular tissue, surrounded by the pericycle and endodermis, then a thick layer of cortex, and finally an outer epidermis or (in woody plants) periderm. Only finer roots (known as feeder roots) actively take up water and minerals, generally in the uppermost meter of soil. These roots absorb minerals primarily through small epidermal structures known as root hairs. In certain plants, adventitious roots grow out from the stem above ground as aerial roots or prop roots, bending down into the soil, to facilitate the exchange of gases or increase support. Certain plants (such as the carrot and beet) have fleshy storage roots with abundant parenchyma in their vascular tissues.
(Botany) A long tapering root possessed by many plants (such as carrots and dandelions). [from early 17th c.]
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  1. (Botany) A long tapering root possessed by many plants (such as carrots and dandelions). [from early 17th c.]
  2. A main root, growing almost vertically downward, from which small branch roots spread out
  3. The main root in gymnosperms, eudicotyledons, and magnoliids, usually stouter than the lateral roots and growing straight downward from the stem. The taproot develops from the primary root. The taproot and its lateral roots penetrate deeper into the soil than the fibrous roots characteristic of monocotyledons.
(Chem.) In organic chemistry, a fundamental, stable arrangement of atoms, as the benzene ring, that may occur in many compounds by atomic substitution without structural change
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  1. (Chem.) In organic chemistry, a fundamental, stable arrangement of atoms, as the benzene ring, that may occur in many compounds by atomic substitution without structural change
  2. (Meteorology) A particle on which water vapor molecules accumulate in free air to form a droplet or ice crystal.
  3. An organelle in the cytoplasm of eukaryotic cells (all cells except prokaryotes) that contains nearly all the cell's DNA and controls its metabolism, growth, and reproduction. The nucleus is surrounded by a pair of membranes called the nuclear envelope , which can be continuous in places with the membranes of the endoplasmic reticulum. The membranes of the nuclear envelope have interconnected pores that allow the exchange of substances with the cell's cytoplasm. The nuclear DNA is wrapped around proteins (called histones) in strands of chromatin , which exists in a matrix known as nucleoplasm (analogous to the cytoplasm outside the nucleus). Just prior to cell division, the chromatin condenses into individual chromosomes, which contain the cell's hereditary information. The nucleus also contains at least one spherical nucleolus , which mainly contains RNA and proteins and directs the construction of the cell's ribosomes.
An identification mark put on, or cut into, the ear of a domestic animal to show ownership
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  1. An identification mark put on, or cut into, the ear of a domestic animal to show ownership
  2. Something specially set aside or reserved; often, specif., a government spending appropriation inserted into a bill, committee report, etc. and directed toward or benefiting a particular recipient
  3. Any identifying mark or feature; characteristic; sign
An implement, especially a felt-tipped pen, used for marking or writing.
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  1. An implement, especially a felt-tipped pen, used for marking or writing.
  2. (Slang, figuratively) A nonmonetary debt owed to someone, especially in return for a favor.
  3. A milestone or similar sign
An indication of a disorder or disease, especially a subjective one such as pain, nausea, or weakness.
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  1. An indication of a disorder or disease, especially a subjective one such as pain, nausea, or weakness.
  2. A subjective indication of a disorder or disease, such as pain, nausea or weakness. Symptoms may be accompanied by objective signs of disease such as abnormal laboratory test results or findings during a physical examination.
  3. Any circumstance, event, or condition that accompanies something and indicates its existence or occurrence; sign; indication
An objective finding, usually detected on physical examination, from a laboratory test, or on an x-ray, that indicates the presence of abnormality or disease.
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  1. An objective finding, usually detected on physical examination, from a laboratory test, or on an x-ray, that indicates the presence of abnormality or disease.
  2. A displayed structure bearing lettering or symbols, used to identify or advertise a place of business:
  3. An act or gesture used to convey an idea, a desire, information, or a command:
A trademark or distinctive name identifying a product, service, or organization.
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  1. A trademark or distinctive name identifying a product, service, or organization.
  2. A product or service so identified:
  3. An association of positive qualities with a widely recognized name, as of a product line or celebrity:
A person or thing of no importance or value
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  1. A person or thing of no importance or value
  2. A system of secret writing based on a key, or set of predetermined rules or symbols
  3. A cryptographic system in which units of text of regular length, usually letters, are transposed or substituted according to a predetermined code.
A binary system for converting information, data, etc. into a form for use in computers, telecommunications, etc.
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  1. A binary system for converting information, data, etc. into a form for use in computers, telecommunications, etc.
  2. A systematized collection of all statutes, or a single comprehensive statute, dealing with one area of the law. See also Bankruptcy Code, Uniform Consumer Credit Code, and Uniform Commercial Code.
  3. The instructions in a computer program. Instructions written by a programmer in a programming language are often called source code . Instructions that have been converted into machine language that the computer understands are called machine code or executable code .
A chemical compound that changes color and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is an indicator that becomes red in the presence of acids and blue in the presence of bases.
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  1. A chemical compound that changes color and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is an indicator that becomes red in the presence of acids and blue in the presence of bases.
  2. An instrument used to monitor the operation or condition of an engine, furnace, electrical network, reservoir, or other physical system; a meter or gauge.
  3. Any of various substances used to indicate the acidity or alkalinity of a solution, the beginning or end of a chemical reaction, the presence of certain substances, etc., by changes in color
A print produced with this process.
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  1. A print produced with this process.
  2. (Architecture, engineering, by extension) A detailed technical drawing (now often in some electronically storable and transmissible form).
  3. A type of paper-based reproduction process producing white-on-blue images, used primarily for technical and architecture's drawings, now largely replaced by other technologies.
A board bearing a sign.
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  1. A board bearing a sign.
  2. (US) A board carrying a sign, or on which signs may be posted.
  3. A board bearing a sign or notice, esp. one advertising a business, product, etc.
(Idiomatic) An obvious clue or indication.
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  1. (Idiomatic) An obvious clue or indication.
  2. A piece of confidential, advance, or inside information.
  3. An indication of an otherwise unknown fact or probability:
A set of symbols showing the composition of a chemical compound. A formula lists the elements contained within it and indicates the number of atoms of each element with a subscript numeral if the number is more than 1. For example, H2 O is the formula for water, where H2 indicates two atoms of hydrogen and O indicates one atom of oxygen.
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  1. A set of symbols showing the composition of a chemical compound. A formula lists the elements contained within it and indicates the number of atoms of each element with a subscript numeral if the number is more than 1. For example, H2 O is the formula for water, where H2 indicates two atoms of hydrogen and O indicates one atom of oxygen.
  2. An established form of words or symbols for use in a ceremony or procedure.
  3. (Mathematics) A statement, especially an equation, of a fact, rule, principle, or other logical relation.
A means of reaching a goal:
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  1. A means of reaching a goal:
  2. A fixed course or territory assigned to a salesperson or delivery person.
  3. A road, course, or way for travel from one place to another:
Something that remains beyond understanding or explanation; a mystery:
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  1. Something that remains beyond understanding or explanation; a mystery:
  2. The true cause or explanation, regarded as not obvious
  3. A method or formula for doing or making something well, especially when not widely known:
The proper or desirable thing:
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  1. The proper or desirable thing:
  2. A printed card or piece of paper that gives a person a specified right, as to attend a theater, ride on a train, claim a purchase, etc.
  3. A legal notice to a person charged with a violation of law, especially a minor violation.
Of or relating to financial assets, especially being or related to those financial assets that add to the net worth of a business:
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  1. Of or relating to financial assets, especially being or related to those financial assets that add to the net worth of a business:
  2. Most important or most serious; principal; chief
  3. First and foremost; principal:
Bright-red, like the robe of a cardinal
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  1. Bright-red, like the robe of a cardinal
  2. Of foremost importance; paramount:
  3. Of main importance; principal; chief
Highest, as in rank or office; foremost
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  1. Highest, as in rank or office; foremost
  2. Most important or significant; main; principal
  3. Highest in rank, authority, or office:
Ranking before all others; foremost in rank, quality, importance, etc.; principal
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  1. Ranking before all others; foremost in rank, quality, importance, etc.; principal
  2. Corresponding in order to the number one.
  3. Ranking above all others, as in importance or quality; foremost:
More prominent or important than others, especially in position or rank:
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  1. More prominent or important than others, especially in position or rank:
  2. First in rank or importance; leading
Having a position in the lead; foremost:
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  1. Having a position in the lead; foremost:
  2. Principal; chief
  3. Ranking first.
Most important; principal.
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  1. Most important; principal.
  2. (Nautical) Connected to or located near the mainmast:
  3. Chief in size, extent, importance, etc.; principal; leading; specif., designating a large central unit on which subsidiaries or branches depend
Characterized by major intervals, scales, etc.
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  1. Characterized by major intervals, scales, etc.
  2. Designating a triad having intervals of a major third between the lower two pitches, and a minor third between the upper two pitches
  3. Equivalent to the distance between the tonic note and the second or third or sixth or seventh degrees of a major scale or mode:
First in rank, order, or importance:
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  1. First in rank, order, or importance:
Highest in rank, power, or authority:
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  1. Highest in rank, power, or authority:
  2. Of chief concern or importance:
First in status or importance; principal or chief:
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  1. First in status or importance; principal or chief:
(Ornithology) Designating or of the large, stiff feathers on the last section, or hand, of a bird's wing
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  1. (Ornithology) Designating or of the large, stiff feathers on the last section, or hand, of a bird's wing
  2. Relating to the replacement of only one of several atoms or groups in a compound, such as an amine in which one valence of the functional group is taken by a carbon atom.
  3. First in importance; chief; principal; main
Being the most desired or suitable example of something:
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  1. Being the most desired or suitable example of something:
  2. From which others are derived; fundamental; basic
  3. First or highest in rank or importance; main:
Highest or among the highest in rank, authority, importance, degree, etc.
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  1. Highest or among the highest in rank, authority, importance, degree, etc.
  2. Of, relating to, or being financial principal, or a principal in a financial transaction.
  3. First or highest in rank or importance.
Of, situated at, or being the top; uppermost, highest, greatest, or foremost
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  1. Of, situated at, or being the top; uppermost, highest, greatest, or foremost
  2. Of the highest degree, quality, rank, or amount:
  3. Of or having to do with the Top 40 or the kind of popular music they represent
Easily reached from various points:
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  1. Easily reached from various points:
  2. Having dominant or controlling power or influence:
  3. Of or constituting a single source controlling all components of a system:
Of, relating to, or serving as a pivot.
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  1. Of, relating to, or serving as a pivot.
  2. On which something turns or depends; central, crucial, critical, etc.
  3. Being of crucial importance; central, key.
Find another word for key. In this page you can discover 64 synonyms, antonyms, idiomatic expressions, and related words for key, like: essential, important, chief, pivotal, latchkey, opener, master-key, passkey, skeleton-key, passe-partout (French) and answer.