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definition of the word rational

by the Wiktionnary

For adjective: From Old French rationel, rational < Latin rationalis (of or belonging to reason, rational, reasonable) < ratio (reason)

For noun: From Old French rational < Mediaeval Latin rationale (a pontifical stole, a pallium, an ornament worn over the chasuble), neut. of Latin rationalis (rational), for which see the first etymology.

rational (comparative more rational, superlative most rational)

Positive
rational

Comparative
more rational

Superlative
most rational

  1. Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like.
    rational conduct
    rational man
  2. (arithmetic) (no comparative or superlative) Of a number, capable of being expressed as the ratio of two integers.


Definition from Wiktionary
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