Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

Examples

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