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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 ?
8) Today, there is a burgeoning literature on the problem, largely traceable to an article by Lewis Kornhauser and Lawrence Sager, published in the Yale Law Journal in 1986, which explained in detail the phenomenon of collective irrationality.
Carrie thus concluded that this proof for the irrationality of [square root of 2] could indeed be generalised to show the irrationality of [square root of n] for all n with some odd powered prime p in the prime decomposition for n, which she then rigorously demonstrated was all non-perfect squares.
However, this irrationality likely stemmed from the psychological need to ignore problems that have no easy solutions.
Nuts: A Collection of the Cult-Hit Columns" is a collection of writings from Joe Dungan who seeks to prove the insanity of Los Angelans and encourage people to stay far, far away from the incessant madness and be glad they don't live in a town where irrationality is law.
Ariely shows that in terms of the standard economic analysis irrationality is commonplace--and, he maintains, predictable.
What is happening in this region of Peru is a monumental crime against the natural world, the tribes, the fauna and is further testimony to the complete irrationality with which we, 'the civilised', treat the world.
MANAMA: The current market irrationality is an opportunity for people to invest heavily in India, says two experts from one of India's top stock brokers.
These fires are the result of irresponsibility and irrationality," she said.
The notion of rational irrationality is inspired by recognition that economic policy is a public good.
Signs of Socrates' irrationality are his persistent attention to poetry, myths, oracles, dreams, and his personal daimonion (55).
The current subprime problems are the result of borrower and lender irrationality, and of government intervention in the market to 'help homeowners.