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Adjective: unofficial  ,ún-u'fi-shul
  1. Not having official authority or sanction
    "a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity"
  2. Not officially established
    "the early election returns are unofficial"

See also: drumhead, informal, loose, summary, unauthorised [Brit], unauthorized, unconfirmed, unsanctioned, wildcat

Antonym: official

Encyclopedia: Unofficial