| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024ir•ra•tion•al /ɪˈræʃənəl/USA pronunciation adj. - lacking sound judgment or logic:an irrational argument.
- not controlled or governed by reason:irrational behavior.
- not having the power of reason:Brute animals are irrational beings.
- Mathematics(of a number) that cannot be expressed exactly as a ratio of two integers:The value of pi is an irrational number.
ir•ra•tion•al•ly, adv. See -ratio-. WordReference Random House Unabridged Dictionary of American English © 2024ir•ra•tion•al (i rash′ə nl),USA pronunciation adj. - without the faculty of reason;
deprived of reason. - without or deprived of normal mental clarity or sound judgment.
- not in accordance with reason;
utterly illogical:irrational arguments. - not endowed with the faculty of reason:irrational animals.
- [Math.]
- Mathematics(of a number) not capable of being expressed exactly as a ratio of two integers.
- Mathematics(of a function) not capable of being expressed exactly as a ratio of two polynomials.
- Mathematics[Algebra.](of an equation) having an unknown under a radical sign or, alternately, with a fractional exponent.
- Poetry[Gk. and Lat. Pros.]
- of or pertaining to a substitution in the normal metrical pattern, esp. a long syllable for a short one.
- noting a foot or meter containing such a substitution.
n. - [Math.]See irrational number.
- Latin irratiōnālis. See ir-2, rational
- late Middle English 1425–75
- 3.See corresponding entry in Unabridged unreasonable, ridiculous; insensate.
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