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Definition of Unofficial
1. Adjective. Not having official authority or sanction. "He participated in an unofficial capacity"
Also: Unauthorised, Unauthorized
Similar to: Drumhead, Summary, Informal, Loose, Unauthorised, Unauthorized, Wildcat, Unsanctioned
Antonyms: Official
Similar to: Drumhead, Summary, Informal, Loose, Unauthorised, Unauthorized, Wildcat, Unsanctioned
Antonyms: Official
2. Adjective. Not officially established. "The early election returns are unofficial"
Similar to: Unconfirmed
Definition of Unofficial
1. not official [adj]