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Not official or formal: An unofficial engagement. (industrial relations & hr … The meaning of unofficial is not authorized or acknowledged by a government, group, class, or society : How to use unofficial in a … Not from a person in authority, the government, etc. : An unofficial report. Definition of unofficial adjective in oxford advanced learners dictionary. Not confirmed officially: Meaning, pronunciation, picture, example sentences, … An unofficial action is not authorized, approved, or organized by a person in authority.