Definitions for unofficial
Random House Webster's College Dictionary
not having official authority or sanction
"a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity"
not officially established
"the early election returns are unofficial"
Kernerman English Learner's Dictionary
not from or done by an official organization
an unofficial statement
Not officially established.
the unofficial results of the ballot
Not acting with official authority.
an unofficial adviser
Not listed in a national pharmacopeia &c.