activate

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ac|ti|vate /'æktɪveɪt/ (activates activating activated)
[VERB] usu passive, be V-ed, V-ed
If a device or process is activated, something causes it to start working.
Video cameras with night vision can be activated by movement.
...a voice-activated computer.
● activation [N-UNCOUNT]
A computer controls the activation of an air bag.

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