Tra từ rational - Từ điển Oxford Advanced Learner 8th

ra·tion·al AW BrE [ˈræʃnəl] NAmE [ˈræʃnəl] adjective
1. (of behaviour, ideas, etc.)based on reason rather than emotions
•a rational argument/choice/decision
•rational analysis/thought
•There is no rational explanation for his actions.
2. (of a person)able to think clearly and make decisions based on reason rather than emotions
Syn: ↑reasonable
•No rational person would ever behave like that.
Opp: ↑irrational
Derived Words: ↑rationality ▪ ↑rationally

Word Origin:
late Middle English (in the sense ‘having the ability to reason’): from Latin rationalis, from ratio(n-) ‘reckoning, reason’, from rat- ‘reckoned’, from the verb reri.

Thesaurus:
rational [rational rationality rationally] adj.
•There is no rational explanation for his actions.
logical • • reasoned • • reasonable • • valid • • well founded • • good • • sound • • solid • • scientific • • coherent •
Opp: irrational
a rational/reasoned/reasonable/valid/good/sound/scientific/coherent argument
a rational/reasoned/reasonable/valid/good/scientific/coherent explanation
rational/logical/reasoned/scientific/coherent thought

Example Bank:
•Humans are essentially rational beings.
•It all seemed quite rational to me.
•Try to be rational about it.
•With children working from the age of ten, large families were economically rational.
•In some ways their behaviour is perfectly rational.
•She said that she had not been fully rational when she signed the form.
•She seems incapable of making a rational decision.
•There's no rational explanation for his actions.
•We need to present them with a rational argument.