Definition of rational:

part of speech: adjective

Pertaining to the reason: endowed with reason: agreeable to reason: sane: intelligent: judicious: ( arith. and alg.) noting a quantity which can be exactly expressed by numbers: ( geog.) noting the plane parallel to the sensible horizon of a place, and passing through the earth's centre.

part of speech: noun


part of speech: adjective

Endowed with reason; agrecable to reason; intelligent.

part of speech: adjective

Having the power to reason, or think connectedly; as, a rational being; agreeable to, or in accord with, reason; as, a rational way of considering things; neither extravagant nor foolish; as, rational conduct; wise; judicious.

part of speech: adverb


Usage examples for rational:

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