- based on or in accordance with reason or logic；able to think sensibly or logically
- 1. based on or in accordance with reason or logic I'm sure there's a perfectly rational explanation 同義詞 反義詞
- ▪ able to think sensibly or logically Ursula's upset—she's not being very rational 同義詞 反義詞
- ▪ endowed with the capacity to reason man is a rational being 同義詞
- 2. (of a number, quantity, or expression) expressible, or containing quantities which are expressible, as a ratio of whole numbers.