E.o. Definition
abbreviation
Ex officio (by virtue of office)
American Heritage
letter
numeral
noun
(street slang) The illicit drug ecstasy (MDMA).
Wiktionary
pronoun
Origin of E.o.
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From Mandarin 鄂 (È), formed as a phono-semantic character from 咢 ("beat a drum", reconstructed Old Chinese pronunciation *Ngˤak) + 阝, the combinatorial form of 邑 ("area", "place").
From Wiktionary