Something indispensable

• sine qua non

  1. An essential element or condition:

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  1. An essential element or condition:

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• requisite

  1. Required; essential.
  2. Something that is indispensable; a requirement:

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  1. Required; essential.
  2. Something that is indispensable; a requirement:

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• prerequisite

  1. Required or necessary as a prior condition:
  2. Something that is prerequisite, as a course that is required prior to taking an advanced course.

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  1. Required or necessary as a prior condition:
  2. Something that is prerequisite, as a course that is required prior to taking an advanced course.

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• precondition

  1. A condition that must exist or be established before something can occur or be considered; a prerequisite.
  2. To condition, train, or accustom in advance.

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  1. A condition that must exist or be established before something can occur or be considered; a prerequisite.
  2. To condition, train, or accustom in advance.

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• need

  1. A condition or situation in which something must be supplied in order for a certain condition to be maintained or a desired state to be achieved:
  2. Something required or wanted; a requisite:
  3. Necessity; obligation:

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  1. A condition or situation in which something must be supplied in order for a certain condition to be maintained or a desired state to be achieved:
  2. Something required or wanted; a requisite:
  3. Necessity; obligation:

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• necessity

  1. The condition or quality of being necessary.
  2. Something necessary:
  3. Something dictated by invariable physical laws.

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  1. The condition or quality of being necessary.
  2. Something necessary:
  3. Something dictated by invariable physical laws.

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• must

  1. To be obliged or required by morality, law, or custom:
  2. To be compelled, as by a physical necessity or requirement:
  3. Used to express a command or admonition:

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  1. To be obliged or required by morality, law, or custom:
  2. To be compelled, as by a physical necessity or requirement:
  3. Used to express a command or admonition:

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• essential

  1. Constituting or being part of the nature or essence of something; inherent:
  2. Fundamentally important or necessary:
  3. Of, relating to, or being a condition or a disease whose cause is unknown:

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  1. Constituting or being part of the nature or essence of something; inherent:
  2. Fundamentally important or necessary:
  3. Of, relating to, or being a condition or a disease whose cause is unknown:

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• condition

  1. A mode or state of being:
  2. Existing circumstances:
  3. Social position; rank.

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  1. A mode or state of being:
  2. Existing circumstances:
  3. Social position; rank.

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A prerequisite

• must

  1. To be obliged or required by morality, law, or custom:
  2. To be compelled, as by a physical necessity or requirement:
  3. Used to express a command or admonition:

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  1. To be obliged or required by morality, law, or custom:
  2. To be compelled, as by a physical necessity or requirement:
  3. Used to express a command or admonition:

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• desideratum

  1. Something considered necessary or highly desirable.

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  1. Something considered necessary or highly desirable.

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• sine qua non (Latin)

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• vital part

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• qualification

  1. The act of qualifying or the condition of being qualified:
  2. A quality, ability, or accomplishment that makes a person suitable for a particular position or task.
  3. A condition or circumstance that must be met or complied with:

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  1. The act of qualifying or the condition of being qualified:
  2. A quality, ability, or accomplishment that makes a person suitable for a particular position or task.
  3. A condition or circumstance that must be met or complied with:

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• proviso

  1. A clause in a document imposing a qualification, condition, or restriction.

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  1. A clause in a document imposing a qualification, condition, or restriction.

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• specification

  1. The act of specifying.
  2. A detailed, exact statement of particulars, especially a statement prescribing materials, dimensions, and quality of work for something to be built, installed, or manufactured.
  3. A single item or article that has been specified.

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  1. The act of specifying.
  2. A detailed, exact statement of particulars, especially a statement prescribing materials, dimensions, and quality of work for something to be built, installed, or manufactured.
  3. A single item or article that has been specified.

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• reservation

  1. The act of reserving; a keeping back or withholding:
  2. A limiting qualification, condition, or exception:
  3. A doubt or misgiving:

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  1. The act of reserving; a keeping back or withholding:
  2. A limiting qualification, condition, or exception:
  3. A doubt or misgiving:

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• precondition

  1. A condition that must exist or be established before something can occur or be considered; a prerequisite.
  2. To condition, train, or accustom in advance.

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  1. A condition that must exist or be established before something can occur or be considered; a prerequisite.
  2. To condition, train, or accustom in advance.

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• first-principle

  1. A basic, foundational proposition or assumption that cannot be deduced from any other proposition or assumption.

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  1. A basic, foundational proposition or assumption that cannot be deduced from any other proposition or assumption.

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• fundamental

  1. Of or relating to the foundation or base; elementary:
  2. Forming or serving as an essential component of a system or structure; central:
  3. Of great significance or entailing major change:

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  1. Of or relating to the foundation or base; elementary:
  2. Forming or serving as an essential component of a system or structure; central:
  3. Of great significance or entailing major change:

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• stipulation

  1. The act of stipulating.
  2. Something specified or agreed to, as in a contract.
  3. The document or agreement, or a provision in a document or agreement, specifying something that is agreed to.

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  1. The act of stipulating.
  2. Something specified or agreed to, as in a contract.
  3. The document or agreement, or a provision in a document or agreement, specifying something that is agreed to.

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• necessity

  1. The condition or quality of being necessary.
  2. Something necessary:
  3. Something dictated by invariable physical laws.

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  1. The condition or quality of being necessary.
  2. Something necessary:
  3. Something dictated by invariable physical laws.

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• terms

  1. plural form of term

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  1. plural form of term

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• indispensable provision

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• provision

  1. The act of providing or supplying something:
  2. The act of making preparations for a possible or future event or situation:
  3. Something provided:

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  1. The act of providing or supplying something:
  2. The act of making preparations for a possible or future event or situation:
  3. Something provided:

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• requisite

  1. Required; essential.
  2. Something that is indispensable; a requirement:

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  1. Required; essential.
  2. Something that is indispensable; a requirement:

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• element

  1. A fundamental, essential, or irreducible constituent of a composite entity.
  2. The basic assumptions or principles of a subject.
  3. A member of a set.

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  1. A fundamental, essential, or irreducible constituent of a composite entity.
  2. The basic assumptions or principles of a subject.
  3. A member of a set.

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• imperative

  1. Necessary or urgent:
  2. Expressing a command or plea; peremptory:
  3. Of, relating to, or constituting the mood that expresses a command or request.

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  1. Necessary or urgent:
  2. Expressing a command or plea; peremptory:
  3. Of, relating to, or constituting the mood that expresses a command or request.

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• essential

  1. Constituting or being part of the nature or essence of something; inherent:
  2. Fundamentally important or necessary:
  3. Of, relating to, or being a condition or a disease whose cause is unknown:

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  1. Constituting or being part of the nature or essence of something; inherent:
  2. Fundamentally important or necessary:
  3. Of, relating to, or being a condition or a disease whose cause is unknown:

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• preliminary condition

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• condition

  1. A mode or state of being:
  2. Existing circumstances:
  3. Social position; rank.

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  1. A mode or state of being:
  2. Existing circumstances:
  3. Social position; rank.

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A need

• requisition

  1. A formal written request for something needed.
  2. A necessity; a requirement.
  3. The state or condition of being needed or put into service.

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  1. A formal written request for something needed.
  2. A necessity; a requirement.
  3. The state or condition of being needed or put into service.

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• exaction

  1. The act of exacting.
  2. Excessive or unjust demand; extortion.
  3. Something exacted.

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  1. The act of exacting.
  2. Excessive or unjust demand; extortion.
  3. Something exacted.

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• compulsion

  1. The act of compelling.
  2. The state of being compelled.
  3. An irresistible impulse to act, regardless of the rationality of the motivation:

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  1. The act of compelling.
  2. The state of being compelled.
  3. An irresistible impulse to act, regardless of the rationality of the motivation:

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• urgency

  1. The quality or condition of being urgent; pressing importance:
  2. A pressing necessity.

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  1. The quality or condition of being urgent; pressing importance:
  2. A pressing necessity.

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• pressing concern

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• obligation

  1. A social, legal, or moral requirement, such as a duty, contract, or promise, that compels one to follow or avoid a particular course of action:
  2. The constraining power of a promise, contract, law, or sense of duty:
  3. A document in which a person binds himself or herself to undertake or refrain from doing a particular act.

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  1. A social, legal, or moral requirement, such as a duty, contract, or promise, that compels one to follow or avoid a particular course of action:
  2. The constraining power of a promise, contract, law, or sense of duty:
  3. A document in which a person binds himself or herself to undertake or refrain from doing a particular act.

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• pinch

  1. To squeeze (something) between the thumb and a finger, the jaws of a tool, or other edges.
  2. To cause pain or discomfort to (a part of the body) by pressing or being too tight:
  3. To nip, wither, or shrivel:

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  1. To squeeze (something) between the thumb and a finger, the jaws of a tool, or other edges.
  2. To cause pain or discomfort to (a part of the body) by pressing or being too tight:
  3. To nip, wither, or shrivel:

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• exigency

  1. A pressing or urgent situation:
  2. An urgent requirement; a pressing need:

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  1. A pressing or urgent situation:
  2. An urgent requirement; a pressing need:

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• extremity

  1. The outermost or farthest point or portion:
  2. The greatest or utmost degree:
  3. Grave danger, necessity, or distress:

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  1. The outermost or farthest point or portion:
  2. The greatest or utmost degree:
  3. Grave danger, necessity, or distress:

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• stress

  1. Importance, significance, or emphasis placed on something.
  2. The relative force with which a sound or syllable is spoken.
  3. The emphasis placed on the sound or syllable spoken most forcefully in a word or phrase.

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  1. Importance, significance, or emphasis placed on something.
  2. The relative force with which a sound or syllable is spoken.
  3. The emphasis placed on the sound or syllable spoken most forcefully in a word or phrase.

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• engrossment

  1. (uncountable) The state of being engrossed; concentration or preoccupation.
  2. (countable) The fact or instance of writing in a legal document.

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  1. (uncountable) The state of being engrossed; concentration or preoccupation.
  2. (countable) The fact or instance of writing in a legal document.

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• prepossession

  1. A preconception or prejudice.
  2. The state of being preoccupied with thoughts, opinions, or feelings.

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  1. A preconception or prejudice.
  2. The state of being preoccupied with thoughts, opinions, or feelings.

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• preoccupation

  1. The state of being preoccupied; absorption of the attention or intellect.
  2. Something that preoccupies or engrosses the mind:

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  1. The state of being preoccupied; absorption of the attention or intellect.
  2. Something that preoccupies or engrosses the mind:

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• obsession

  1. Compulsive preoccupation with a fixed idea or an unwanted feeling or emotion, often accompanied by symptoms of anxiety.
  2. A compulsive, often unreasonable idea or emotion.

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  1. Compulsive preoccupation with a fixed idea or an unwanted feeling or emotion, often accompanied by symptoms of anxiety.
  2. A compulsive, often unreasonable idea or emotion.

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• claim

  1. To demand, ask for, or take as one's own or one's due:
  2. To take in a violent manner as if by right:
  3. To state to be true, especially when open to question; assert or maintain:

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  1. To demand, ask for, or take as one's own or one's due:
  2. To take in a violent manner as if by right:
  3. To state to be true, especially when open to question; assert or maintain:

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• call

  1. To say in a loud voice; announce:
  2. To demand or ask for the presence of:
  3. To demand or ask for a meeting of; convene or convoke:

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  1. To say in a loud voice; announce:
  2. To demand or ask for the presence of:
  3. To demand or ask for a meeting of; convene or convoke:

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• demand

  1. To ask for urgently or peremptorily:
  2. To claim as just or due:
  3. To ask to be informed of:

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  1. To ask for urgently or peremptorily:
  2. To claim as just or due:
  3. To ask to be informed of:

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• want

  1. To have a strong feeling to have (something); wish (to possess or do something); desire greatly:
  2. To desire (someone to do something):
  3. To request the presence or assistance of:

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  1. To have a strong feeling to have (something); wish (to possess or do something); desire greatly:
  2. To desire (someone to do something):
  3. To request the presence or assistance of:

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• lack

  1. Deficiency or absence:
  2. A particular deficiency or absence:
  3. To be without or in need of:

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  1. Deficiency or absence:
  2. A particular deficiency or absence:
  3. To be without or in need of:

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• necessary

  1. Needed or required:
  2. Unavoidably determined by prior conditions or circumstances; inevitable:
  3. Logically inevitable:

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  1. Needed or required:
  2. Unavoidably determined by prior conditions or circumstances; inevitable:
  3. Logically inevitable:

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• necessity

  1. The condition or quality of being necessary.
  2. Something necessary:
  3. Something dictated by invariable physical laws.

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  1. The condition or quality of being necessary.
  2. Something necessary:
  3. Something dictated by invariable physical laws.

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