A fundamental principle or underlying concept

• rudiment

  1. A fundamental element, principle, or skill, as of a field of learning:
  2. Something in an incipient or undeveloped form:
  3. An imperfectly or incompletely developed organ or part.

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  1. A fundamental element, principle, or skill, as of a field of learning:
  2. Something in an incipient or undeveloped form:
  3. An imperfectly or incompletely developed organ or part.

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• root

  1. The usually underground portion of a plant that lacks buds, leaves, or nodes and serves as support, draws minerals and water from the surrounding soil, and sometimes stores food.
  2. Any of various other underground plant parts, especially an underground stem such as a rhizome, corm, or tuber.
  3. The embedded part of an organ or structure such as a hair, tooth, or nerve, that serves as a base or support.

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  1. The usually underground portion of a plant that lacks buds, leaves, or nodes and serves as support, draws minerals and water from the surrounding soil, and sometimes stores food.
  2. Any of various other underground plant parts, especially an underground stem such as a rhizome, corm, or tuber.
  3. The embedded part of an organ or structure such as a hair, tooth, or nerve, that serves as a base or support.

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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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• fundament

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• foundation

  1. The act of founding, especially the establishment of an institution with provisions for future maintenance.
  2. The basis on which a thing stands, is founded, or is supported.
  3. Funds for the perpetual support of an institution; an endowment.

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  1. The act of founding, especially the establishment of an institution with provisions for future maintenance.
  2. The basis on which a thing stands, is founded, or is supported.
  3. Funds for the perpetual support of an institution; an endowment.

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• basis

  1. A foundation upon which something rests.
  2. The chief constituent; the fundamental ingredient:
  3. The fundamental principle.

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  1. A foundation upon which something rests.
  2. The chief constituent; the fundamental ingredient:
  3. The fundamental principle.

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• base

  1. The lowest or bottom part:
  2. The part of a plant or animal organ that is nearest to its point of attachment.
  3. The point of attachment of such an organ.

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  1. The lowest or bottom part:
  2. The part of a plant or animal organ that is nearest to its point of attachment.
  3. The point of attachment of such an organ.

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