Meaning of “unofficial” in the English Dictionary

"unofficial" in British English

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(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 recognized office or authority:

We think of him as the unofficial town historian.
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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uk /ˌʌnəˈfɪʃəl/ us

not officially approved 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 industrial average fell 10.12 points.

not part of an official plan or someone's official business:

an unofficial policy/visit The company has an unofficial policy of allowing a number of houses to fall into disrepair before seeking private contractors to do the work.

He said he had been given the information unofficially.

(Definition of “unofficial” from the Cambridge Business English Dictionary © Cambridge University Press)