a person appointed or elected to an office or charged with certain duties.
of or pertaining to an office or position of duty, trust, or authority: official powers.
authorized or issued authoritatively: an official report.
holding office.
appointed or authorized to act in a designated capacity: an official representative.
(of an activity or event) intended for the notice of the public and performed or held on behalf of officials or of an organization; formal: the official opening of a store.
Pharmacology. noting drugs or drug preparations that are recognized by and that conform to the standards of the United States Pharmacopeia or the National Formulary.

1300–50; Middle English < Late Latin officiālis of duty, equivalent to Latin offici(um) office + -ālis -al1

officially, adverb
nonofficial, adjective
nonofficially, adverb
preofficial, adjective
preofficially, adverb
pseudoofficial, adjective, noun
pseudoofficially, adverb
quasi-official, adjective
quasi-officially, adverb
subofficial, noun, adjective
subofficially, adverb
underofficial, adjective
unofficial, adjective
unofficially, adverb

official, officious. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
official (əˈfɪʃəl)
1.  of or relating to an office, its administration, or its duration
2.  sanctioned by, recognized by, or derived from authority: an official statement
3.  appointed by authority, esp for some special duty
4.  having a formal ceremonial character: an official dinner
5.  a person who holds a position in an organization, government department, etc, esp a subordinate position

Official (əˈfɪʃəl)
1.  of or relating to one of the two factions of the IRA and Sinn Féin, created by a split in 1969. The Official movement subsequently renounced terrorism and entered constitutional politics in the Irish Republic as the Workers' Party (now the Democratic Left)
2.  a member of the Official IRA and Sinn Féin

unofficial (ˌʌnəˈfɪʃəl)
1.  not official or formal: an unofficial engagement
2.  not confirmed officially: an unofficial report
3.  (of a strike) not approved by the strikers' trade union
4.  (of a medicinal drug) not listed in a pharmacopoeia

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1314, from O.Fr. official (12c.), from L. officialis "attendant to a magistrate, public official," noun use of officialis (adj.) "of or belonging to duty, service, or office," from officium (see office). Meaning "person in charge of some public work or duty" first recorded
1555. The adj. is first attested 1533, from O.Fr. oficial, from L. officialis. Officialese "language of officialdom" first recorded 1884.

1798, from un- (1) "not" + official.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

official of·fi·cial (ə-fĭsh'əl)
Authorized by or contained in the U.S. Pharmacopoeia or National Formulary. Used of drugs.

unofficial un·of·fi·cial (ŭn'ə-fĭsh'əl)
Of or being a drug that is not listed in the United States Pharmacopeia or the National Formulary.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Legend has it that they observed an unofficial ceasefire while underground.
Applications without unofficial transcripts attached to the application will
  not receive consideration.
On the other extreme are countries in which the independent press acts as an
  unofficial political opposition.
And if official and unofficial government reports are to be believed, the
  methods work.
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