1
- not logical or reasonable不合逻辑的; 不合理的。
1.1
- not endowed with the power of reason无理性的; 失去理性的。
2
- Mathematics (of a number, quantity, or expression) not expressible as a ratio of two integers, and having an infinite and non-recurring expansion when expressed as a decimal. Examples of irrational numbers are the number π and the square root of 2【数】无理的。
- Mathematics an irrational number or quantity; a surd【数】无理数; 无理量; 不尽根。
派生词
irrationality
nounirrationalize
（亦作-ise）verbirrationally
adverb词源
late Middle English: from Latin irrationalis, from in- 'not' + rationalis （see RATIONAL）.