[ˈraʃən(ə)l], (Adjective)

Definitions:
- based on or in accordance with reason or logic
(e.g: I'm sure there's a perfectly rational explanation)

- (of a number, quantity, or expression) expressible, or containing quantities which are expressible, as a ratio of whole numbers


Phrases:

Origin:
late Middle English (in the sense ‘having the ability to reason’): from Latin rationalis, from ratio(n-) ‘reckoning, reason’ (see ratio)