activate
[verb]
Synonyms: start, arouse, energize, galvanize, initiate, mobilize, move, rouse, set in motion, stir

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Antonyms: arrest
Related Words: arouse, awaken, rally, rouse, stir, wake, waken

[TahlilGaran] English Synonym Dictionary ▲

ac‧tiv‧ate /ˈæktəveɪt, ˈæktɪveɪt/ verb [transitive] technical
to make an electrical system or chemical process start working Antonym : deactivate:
Cooking fumes may activate the alarm.
The yeast’s growth is activated by sugar and warmth.
—activation /ˌæktəˈveɪʃən, ˌæktɪˈveɪʃən/ noun [uncountable]

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In everyday English, people usually use set off rather than activate when talking about electrical systems:
Someone has set off the smoke alarm again.

[TahlilGaran] Dictionary of Contemporary English ▲