[ɪˈraʃən(ə)l], (Adjective)

Definitions:
- not logical or reasonable
(e.g: irrational feelings of hostility)

- (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


Phrases:

Origin:
late Middle English: from Latin irrationalis, from in- ‘not’ + rationalis (see rational)

[ɪˈraʃən(ə)l], (Noun)

Definitions:
- an irrational number or quantity; a surd


Phrases:

Origin:
late Middle English: from Latin irrationalis, from in- ‘not’ + rationalis (see rational)