rationally

ra•tion•al adj.

based on reason; fitting in with reason;
sensible:a rational decision.
using reason:a rational negotiator.
sane;
able to think or speak clearly and logically:The patient seems perfectly rational.

ra•tion•al•i•ty n. [uncountable]
ra•tion•al•ly, adv. See -ratio-.

ra•tion•al adj.

agreeable to reason;
reasonable;
sensible:a rational plan for economic development.
having or exercising reason, sound judgment, or good sense:a calm and rational negotiator.
being in or characterized by full possession of one's reason;
sane;
lucid:The patient appeared perfectly rational.
endowed with the faculty of reason:rational beings.
of, pertaining to, or constituting reasoning powers:the rational faculty.
proceeding or derived from reason or based on reasoning:a rational explanation.
Mathematics
- capable of being expressed exactly by a ratio of two integers.
- (of a function) capable of being expressed exactly by a ratio of two polynomials.
Poetry[Class. Pros.]capable of measurement in terms of the metrical unit or mora.

Latin ratiōnālis, equivalent. to ratiōn- (stem of ratiō) reason + -ālis -al¹
Middle English racional 1350–1400

ra′tion•al•ly, adv.
ra′tion•al•ness, n.

reasonable.

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