Definition of activate
: to make active or more active: as a (1) : to make (as molecules) reactive or more reactive (2) : to convert (as a provitamin) into a biologically active derivative b : to make (a substance) radioactive c : to treat (as carbon or alumina) so as to improve adsorptive properties d (1) : to set up or formally institute (as a military unit) with the necessary personnel and equipment (2) : to put (an individual or unit) on active duty
: to become active
activationplay \ˌak-tə-ˈvā-shən\ noun
activatorplay \ˈak-tə-ˌvā-tər\ noun
Examples of activate in a sentence
Touch the screen to activate the system.
activate and then deactivate a mechanism
The camera is activated by pushing a button.
The bomb was activated by remote control.
Sunlight activates a chemical reaction in the plant's leaves.
vitamins that activate the growth of new cells
The President has activated the reserves.
First Known Use of activate
ACTIVATE Defined for Kids
Definition of activate for Students
: to start working or cause to start working <Activate the alarm.>
Medical Definition of activate
: to make active or more active: asa: to convert into a biologically active derivative or form <activated plasminogen>b: to make biologically or molecularly active <activate protein synthesis> <The [spinal] cord also contains neuronal circuits …that can be activated by incoming sensory signals without input from the brain …—John W. McDonald et al., Scientific American, September 1999>c: to make (a substance) radioactive
activation\ˌak-tə-ˈvā-shən\ play noun
Seen and Heard
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