Definitions

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

  • noun The state or quality of being irrational.
  • noun An irrational idea, expression, or act.

from The Century Dictionary.

  • noun In mathematics, incommensurability.
  • noun The condition of being irrational; want of the faculty or the quality of reason; fatuity: as, the irrationality of brutes; the irrationality of a scheme.
  • noun That which is irrational; an irrational thought, action, or thing.

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

  • noun The quality or state of being irrational; absence of rationality.

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

  • noun The quality or state of being irrational; want of the faculty or the quality of reason; fatuity.
  • noun Something which is irrational or brought forth by irrational action, judgement, idea or thought.

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

  • noun the state of being irrational; lacking powers of understanding

Etymologies

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