From King Dictionary of Contemporary English unofficial un‧of‧fi‧cial / ˌʌnəˈfɪʃ əl◂ / ●○○ adjective 1 LET/ALLOW# done or produced without formal approval or permission Hodges wrote an unofficial biography of the artist. 2 PUBLIC/NOT PRIVATE# not done as part of your job The president made an unofficial visit to the Senator’s house. — unofficially adverb Examples from the Corpus unofficial • Released 25 years ago, the recording became the unofficial anthem of my first-ever election campaign. • Even expressways were planned as man-made barriers, the unofficial borders. • This is an unobtrusive way of keeping expensive unofficial calls to the minimum. • After the official Red Square parade there were two unofficial marches in Moscow, sanctioned by the city soviet. • An informal and unofficial market began to develop. • Feinstein emphasized that the trip was "an unofficial mission." • And as you head out to grab lunch, it seems as if an unofficial national holiday has been declared. • Now Bush has regained his position as frontrunner by winning the first unofficial rounds of the campaign. • Unofficial sources say that over 100 people were shot dead in the rioting. • She seems to have become the unofficial spokesman for the group. • "Take Me Home, Country Road" became West Virginia's unofficial state song. • The Prime Minister discussed the mater with his German counterpart on an unofficial visit to his home last month. • Artists who had once been considered unofficial were later accepted into the official art world and viceversa. From King Business Dictionary unofficial un‧of‧fi‧cial / ˌʌnəˈfɪʃ əl◂ / adjective 1 without formal approval and permission from the organization or person in authority He made his complaint through unofficial channels. 2 not made publicly known as part of an official plan Our unofficial policy is to grant two days’ paternity leave. — unofficially adverb The trade union was unofficially formed in 1972.