unofficial Meaning in the Cambridge English Dictionary
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Meaning of “unofficial” in the English Dictionary

"unofficial" in British English

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unofficialadjective

uk   us   /ˌʌn.əˈfɪʃ.əl/
not ​official; not from a ​person in ​authority, the ​government, etc.: unofficial ​estimates/​figures/​reports
unofficially
adverb uk   us   /-i/
(Definition of unofficial from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unofficial" in American English

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unofficialadjective [not gradable]

 us   /ˌʌn·əˈfɪʃ·əl/
not ​connected with or coming from a ​recognizedoffice or ​authority: We ​think of him as the unofficial ​townhistorian.
unofficially
adverb  us   /ˌʌn·əˈfɪʃ·ə·li/
Unemployment has been unofficially estimated at 70%.
(Definition of unofficial from the Cambridge Academic Content Dictionary © Cambridge University Press)

"unofficial" in Business English

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unofficialadjective

uk   us   /ˌʌnəˈfɪʃəl/
not ​officiallyapproved by a ​person in ​authority, the ​government, etc.: unofficial estimates/figures/targets Profits were below unofficial ​estimates.unofficial data/reports/results Based on early and unofficial ​data, the Dow Jones ​industrialaveragefell 10.12 ​points.
not ​part of an ​officialplan or someone's ​officialbusiness: an unofficial policy/visit The ​company has an unofficial ​policy of ​allowing a ​number of ​houses to ​fall into disrepair before ​seekingprivatecontractors to do the ​work.
unofficially
adverb
He said he had been given the ​information unofficially.
(Definition of unofficial from the Cambridge Business English Dictionary © Cambridge University Press)
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