Etymology
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official (n.)

early 14c., "minor ecclesiastical court officer" (mid-13c. as a surname), from Old French oficial "law officer; bishop's representative" (12c.) and directly from Late Latin officialis "attendant to a magistrate, public official," noun use of officialis (adj.) "of or belonging to duty, service, or office" (see official (adj.)). From mid-14c. as "a domestic retainer in a household;" the meaning "person in charge of some public work or duty, one holding a civil appointment" is recorded from 1550s.

official (adj.)

late 14c., "performing a service" (a sense now obsolete); c. 1400, "required by duty," from Old French oficial "official; main, principal" (14c., Modern French officiel) and directly from Late Latin officialis "of or belonging to duty, service, or office," from Latin officium "service, kindness, favor; official duty, function, business; ceremonial observance," literally "work-doing," from ops (genitive opis) "power, might, abundance, means" (related to opus "work," from PIE root *op- "to work, produce in abundance") + combining form of facere "to make, to do" (from PIE root *dhe- "to set, put").

Meaning "pertaining to an office or official position" is from c. 1600. That of "derived from the proper office or officer," hence "authorized," is by 1854.

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Definitions of official
1
official (adj.)
having official authority or sanction;
an official representative
official permission
official (adj.)
of or relating to an office;
official privileges
official (adj.)
verified officially;
the election returns are now official
official (adj.)
conforming to set usage, procedure, or discipline;
Synonyms: prescribed
official (adj.)
(of a church) given official status as a national or state institution;
2
official (n.)
a worker who holds or is invested with an office;
Synonyms: functionary
official (n.)
someone who administers the rules of a game or sport;
the golfer asked for an official who could give him a ruling
From wordnet.princeton.edu