irrational

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ir·ra·tion·al

 (ĭ-răsh′ə-nəl)
adj.
1.
a. Not endowed with reason.
b. Affected by loss of usual or normal mental clarity; incoherent, as from shock.
c. Marked by a lack of accord with reason or sound judgment: an irrational dislike.
2.
a. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern.
b. Being a metric foot containing such a syllable.
3. Mathematics Of or relating to an irrational number.
n. Mathematics
An irrational number.

ir·ra′tion·al·ly adv.
ir·ra′tion·al·ness n.

irrational

(ɪˈræʃənəl)
adj
1. inconsistent with reason or logic; illogical; absurd
2. incapable of reasoning
3. (Mathematics) maths
a. not rational
b. (as noun): an irrational.
4. (Poetry) 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
irˈrationally adv
irˈrationalness n

ir•ra•tion•al

(ɪˈræʃ ə nl)

adj.
1. lacking the faculty of reason; deprived of reason.
2. lacking sound judgment or logic: irrational arguments.
3. not controlled or governed by reason: irrational behavior.
4.
a. (of a number) not capable of being expressed exactly as a ratio of two integers.
b. (of a function) not capable of being expressed exactly as a ratio of two polynomials.
c. (of an equation) having an unknown under a radical sign or, alternately, with a fractional exponent.
5. of or pertaining to a syllable in Greek or Latin prosody whose quantity does not fit the meter.
n.
[1425–75; late Middle English < Latin]
ir•ra′tion•al•ly, adv.
ir•ra′tion•al•ness, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.irrational - a real number that cannot be expressed as a rational number
real, real number - any rational or irrational number
transcendental number - an irrational number that is not algebraic
algebraic number - root of an algebraic equation with rational coefficients
Adj.1.irrational - not consistent with or using reason; "irrational fears"; "irrational animals"
incoherent - without logical or meaningful connection; "a turgid incoherent presentation"
illogical, unlogical - lacking in correct logical relation
unreasonable - not reasonable; not showing good judgment
rational - consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
2.irrational - real but not expressible as the quotient of two integers; "irrational numbers"
math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
rational - capable of being expressed as a quotient of integers; "rational numbers"

irrational

adjective
2. senseless, wild, crazy, unstable, insane, mindless, demented, aberrant, brainless They behaved in such a bizarre and irrational manner.

irrational

adjective
Not governed by or predicated on reason:
Translations
iracionální
epälooginenirrationaalinen

irrational

[ɪˈræʃənl] ADJ [behaviour, person, belief] → irracional

irrational

[ɪˈræʃənəl] adj
[feeling, behaviour, idea, belief] → irrationnel(le)
an irrational fear of science → une peur irrationnelle de la science
[argument] → irrationnel(le)
to be irrational → être irrationnel

irrational

adj
(= illogical, also Math, Psych) → irrational; fear, beliefunsinnig, irrational; (= not sensible)unvernünftig; he had become quite irrational about iter hatte eine irrationale Einstellung dazu entwickelt; if you maintain X, then it is irrational to deny Ywenn Sie X behaupten, ist es widersinnig or unlogisch, Y zu leugnen
(= not having reason) animalvernunftlos

irrational

[ɪˈræʃənl] adjirrazionale
an irrational fear → una paura irrazionale
he had become quite irrational about it → era diventato piuttosto irragionevole al riguardo

ir·ra·tion·al

n. irracional.
References in periodicals archive ?
Aleph-one counts all the real numbers--the rationals plus the irrationals such as pi and the square root of z.
Given the fact that the interval between 1 and the square root of 2 is less than 1/2, it might seem unfathomable that the numbers in this interval contain an uncountably infinite set of irrationals.
infinity]] contains the irrationals of K then K - [K.
The word "number", semantically and cognitively, is used by mathematicians, and others, to refer to many different things, often related (wholes, cardinal, ordinal, fractions, evens, primes, irrationals, transcendentals, imaginary, complex, transfinite), "some of which are nearer the central, prototypical meaning .
Putting the four irrationals in order, starting with the most irregular, gives pi, [square root of 2], e, and [square root of 3].