irrational
/ɪˈɹæʃ.(ə.)nəl/ adjective, noun
Forms irrationals
- adjective Not rational; unfounded, nonsensical or wrong-headed. “an irrational decision”
- adjective (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers. “The number π is irrational.”
- noun (mathematics) A real number that can not be expressed as the quotient of two integers, an irrational number.
Synonyms
Antonyms
Etymology
From Latin irratiōnālis, from ir- + ratiōnālis.
Webster’s 1913
- adjective Not rational; void of reason or understanding; as, brutes are irrational animals.
- adjective Not according to reason; absurd; foolish.
Etymology [L. irrationalis: cf. F. irrationnel. See In- not, and Rational.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “irrational”, CC BY-SA 4.0. Details