Meaning of “acting” in the English Dictionary

(Definition of “acting” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"acting" in American English

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actingadjective [ not gradable ]

us /ˈæk·tɪŋ/

temporarily performing someone else's duties:

Ms. Lopez-Smith will be the acting treasurer.

(Definition of “acting” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"acting" in Business English

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actingadjective [ before noun ]

uk /ˈæktɪŋ/ us

doing a job for a short time while the person who usually does that job is not there:

acting chairman/director/president Fisher will serve as acting director while a search is under way to name a permanent director

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