Meaning of “activate” in the English Dictionary

"activate" in British English

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activateverb [ T ]

uk /ˈæk.tɪ.veɪt/ us /ˈæk.tə.veɪt/

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

"activate" in American English

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activateverb [ T ]

us /ˈæk·təˌveɪt/

to cause something to start working:

Something activated the car alarm.

In sports, to activate a player is to bring that player back to the regular team after an injury.

activation
noun [ U ] us /ˌæk·təˈveɪ·ʃən/

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

"activate" in Business English

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activateverb [ T ]

uk /ˈæktɪveɪt/ us

to make something start working or happening:

New customers must call an automated line to activate their card.
The move will activate a clause in the contract which gives the company the option to sell or demand the outstanding £3.5m owed on the deal.

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