The meaning of UNOFFICIAL is not authorized or acknowledged by a government, group, class, or society : not official. How to use unofficial in a sentence.

UNOFFICIAL definition: not official or formal See examples of unofficial used in a sentence.

Definition of unofficial adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

UNOFFICIAL definition: 1. not official; not from a person in authority, the government, etc.: 2. not official; not from a…. Learn more.

Jan 18, 2026 · Adjective unofficial (comparative more unofficial, superlative most unofficial) Not officially established.

1. Not official: the unofficial election results. 2. Not acting officially: an unofficial adviser.

Factsheet What does the word unofficial mean? There are five meanings listed in OED's entry for the word unofficial. See ‘Meaning & use’ for definitions, usage, and quotation evidence.