1. executive order.

  1. a combining form meaning “early,” “primeval,” used in the formation of compound words: Eocene; eohippus.

  1. ex officio.

adverb Latin.

  1. by that very fact.

adverb Latin.

  1. by that name.

combining form

  1. early or primevalEocene; eohippus

abbreviation for

  1. ex officio

word-forming element used from mid-19c. (first in Eocene) in compound words formed by earth-scientists and meaning “characterized by the earliest appearance of,” from Greek eos “dawn,” from PIE *aus-, cognate with Modern English east (q.v.). Piltdown Man, before exposed as a fraud, was known as Eoanthropus.

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