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to render more reactive; excite: to activate a molecule. to induce radioactivity. to aerate (sewage) in order to accelerate decomposition of impure organic matter by microorganisms.
1. To set in motion; make active or more active. 2. To organize or create (a military unit, for example): activate the National Guard. 3. To treat (sewage) with aeration and bacteria to aid decomposition. 4. Chemistry To accelerate a reaction in, as by heat. 5. Physics To make (a substance) radioactive. 6.
to make something start working: The alarm can be activated by a laser beam. (Definition of activate from the Cambridge Learner's Dictionary © Cambridge University Press)
