Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The quality or condition of being rational.
  • n. A rational belief or practice.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Quality or state of being rational; agreement with reason; possession of reason; due exercise of reason; reasonableness.
  • n. Objectivity, considerateness.

from the GNU version of the Collaborative International Dictionary of English

  • n. The quality or state of being rational; agreement with reason; possession of reason; due exercise of reason; reasonableness.

from The Century Dictionary and Cyclopedia

  • n. The rational faculty; the power of reasoning; possession of reason; intelligence.
  • n. The character of being rational; accordance with reason; reasonableness; congruity; fitness.
  • n. The exercise, result, or manifestation of reason; rational principle, motive, or causation; basis in reason.
  • n. In mathematics, the state of corresponding to or being producible by a rational transformation or operation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the state of having good sense and sound judgment
  • n. the quality of being consistent with or based on logic

Etymologies

From French rationalité, from Late Latin rationalitas ("rationality, reasonableness"), from Latin rationalis ("reasonable") (Wiktionary)

Examples

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