English

Noun

irrationality ‎(countable and uncountable, plural irrationalities)

1. The quality or state of being irrational; want of the faculty or the quality of reason; fatuity.
2. Something which is irrational or brought forth by irrational action, judgement, idea or thought.
3. (mathematics) The property of being irrational.

Synonyms

• unreason

Antonyms

• rationality

Translations

References

• irrationality in The Century Dictionary, The Century Co., New York, 1911
• irrationality in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913