rational

rational · adjective, noun¹

1. Latin · derived fromrationalis“of or belonging to reason, rational, reasonable; having a ratio”
2. Old French · derived fromrationel
3. English todayrational

From Old French rationel, rational, from Latin rationalis (“of or belonging to reason, rational, reasonable; having a ratio”), from ratio (“reason; calculation”).

rational · noun²

1. Latin · derived fromrationalis“rational”
2. Old French · derived fromrational
3. English todayrational

From Old French rational, from Medieval Latin rationale (“a pontifical stole, a pallium, an ornament worn over the chasuble”), neuter of Latin rationalis (“rational”), for which see the first etymology. Translation of λογεῖον (logeîon) or perhaps λόγιον (lógion, “oracle”) in the Septuagint version of Exodus 28.

Words from the same roots