Etymology

arational

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Today it means: Not within the domain of what can be understood or analyzed by reason; not rational, outside the competence of the rules of reason. Full definition →

First used 20th c.English rational ← Ancient Greek ἀ- (a-) ← Proto-Hellenic *ə-
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Hellenic*ə-
  4. Ancient Greekἀ- (a-)
  5. Englisha-
  6. Englishrational
  7. English todayarational

From a- + rational.

First known use, by meaning

  • from 20th c. Not within the domain of what can be understood or analyzed by reason; not rational, outside the competence of the rules of reason.

Etymology from Wiktionary, CC BY-SA 4.0.