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definition 1: sensible or reasoned.
example: Deciding to stay in during the ice storm was a rational choice.
definition 2: in control of one’s senses or mental faculties; not insane, hysterical, or deluded.
example: He’d had too much to drink and was no longer rational.
definition 3: characteristically logical, or marked by the use of logic.
example: Becoming a lawyer requires a rational mind.
example: They came to an answer through a rational discussion of the issues.
example: She gave a strong, rational argument for her position.
See full entry
Collocations: Words often used in combination with the adjective rational
rational + NOUN: ~ argument, ~ explanation, ~ thought, ~ choice, ~ decision, ~ debate, ~ basis (e.g., The decision must be made on a rational basis and not on our emotions), ~ thinking, ~ inquiry, ~ discourse, ~ decision-making, ~ justification, ~ behavior, ~ response
ADVERB + rational: perfectly ~ (e.g., His explanation for what happened was perfectly rational), entirely ~ , wholly ~ , purely ~ , seemingly ~