EO

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eo-

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

Origin:
< Greek, combining form of ēṓs (Attic héōs) dawn; akin to east, Aurora

e.o.

ex officio.

eo ipso

[ey-oh ip-soh; English ee-oh ip-soh]
Latin.
by that very fact.

eo nomine

[ey-oh noh-mi-ne; English ee-oh nom-i-nee]
Latin.
by that name.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
e.o.
 
abbreviation for
ex officio

eo-
 
combining form
early or primeval: Eocene; eohippus
 
[from Greek, from ēōs dawn]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

eo-
prefix used from mid-19c. in compound words formed by earth-scientists and meaning characterized by the earliest appearance of, from Gk. eos dawn, from PIE *ausus, cognate with Mod.Eng. east (q.v.). Piltdown Man, before exposed as a fraud, was known as Eoanthropus.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
eo
Esperanto
EO
  1. ethylene oxide

  2. executive order

e.o.
Latin ex officio (by virtue of office)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
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