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1. Maths
a. not rational
b. (as noun)
2. Prosody in Greek or Latin verse
a. of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one
b. denoting a metrical foot where such an irregularity occurs



in the most general meaning, that which is beyond the bounds of reason; alogical or nonintellectual; incommensurable with rational thinking or even contradicting it. The irrational is generally contrasted with the rational. The irrational as something inaccessible to rational cognition and inexpressible in logical concepts is one of the basic reference points for a number of idealistic currents, jointly referred to as philosophical irrationalism (for example, intuitionism and voluntarism). In the religious world view the rational is viewed as prerational (spontaneous-chaotic, not shaped by the Logos), as distinguished from both the rational and suprarational (the mystical, given in revelation).

In the theory of knowledge of dialectical materialism the irrational is understood to be something not yet known but knowable in principle.

References in periodicals archive ?
Calling irrationality "ignorance" is fine and good for the sake of reaching a larger audience, but there are important theoretical lines separating the two, thanks to Caplan's work.
His blatant irrationality reveals what Conservatism must always mean a divided nation.
Richard Banks's Beyond Profiling: Race, Policing, and the Drug War, which criticizes the current debate over racial profiling for focusing too much on profiling's alleged irrationality.
A failure on the agent's part to come up to such standards makes this agent guilty of a form of [criticisable] irrationality.
Even though Premier League boss Richard Scudamore is responsible for helping to promote equality in the game, he hasn't even been disciplined for his part in messages which "joked" about "gash", "big t***d broads" and women's irrationality after childbirth.
The emails referred to women in a derogatory terms, contained sexual innuendos, and made jokes about "female irrationality.
TEHRAN (FNA)- Expediency Council Chairman and former Iranian President Akbar Hashemi Rafsanjani blasted Washington for tightening its unilateral sanctions against Iran, reiterating that the new US embargos targeting Iran's energy sector show imprudence and irrationality of American statesmen.
Washington, July 2 ( ANI ): While economists argue that markets are driven by rational behavior, psychologists have found that the markets are not immune from human irrationality, whether that irrationality is due to optimism, fear, greed, or other forces, a new study has found.
Irrationality in health care; what behavioral economics reveals about what we do and why.
Both the public irrationality thesis and the Republican brain hypothesis claim that ideological polarization arises from overreliance on cognitive rules of thumb.
Pointing out the illegality and irrationality in the order, the court said the inquiry against Gupta was conducted in an " unfair" manner.
It's inventive, funny and clever and entertains on all sorts of levels, yet buried within the sheer daft exhuberance are astute observations on human life in all its irrationality.