rational
UK: ˈræʃənəl | US: ˈræʃənəl
adj. based on reason or logic
adj. capable of thinking clearly
n. (Mathematics) a number expressible as a ratio of integers
Derived from Latin rationalis ("of reason"), from ratio ("reckoning, calculation, reason"). The root rat- (from ratus, past participle of reri "to reckon") reflects the idea of logical judgment. The suffix -ion nominalizes the concept, while -al adapts it into an adjective. Over time, "rational" evolved from mathematical precision to broader logical reasoning.
She made a rational decision after analyzing the data.
Humans are considered rational beings.
The debate required rational arguments, not emotional appeals.
√2 is not a rational number.
His rational approach solved the complex problem efficiently.