Definition of activate
: to make active or more active: such asa (1) : to make (something, such as a molecule) reactive or more reactive (2) : to convert (something, such as a provitamin) into a biologically active derivativeb : to make (a substance) radioactivec : to treat (a substance, such as carbon or alumina) so as to improve adsorptive propertiesd (1) : to set up or formally institute (an organized group, such 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.
Recent Examples of activate from the Web
Thinking the cars were being stolen or towed, the security feature activated and the cars went into a self-locking mode, leaving them immobile, ReachNow said.
The man activated his emergency position indicating radio beacon.
INSIDE PITCH JACOBY ELLSBURY, who is eligible to come off the seven-day concussion disabled list on Thursday, could be activated for the weekend series in Toronto, Manager Joe Girardi said.
The Marlins are expected to activate Locke from the disabled list and hand him his first start on Thursday.
McGrath was activated from San Antonio’s seven-day DL.
Baseball’s No. 1 prospect, second baseman Yoan Moncada, was activated from the disabled list by the Triple-A Charlotte Knights.
Crizer activated his stun gun, hitting Spates in the arm, and Spates put the vehicle in reverse and rammed Crizer's vehicle parked behind him in an attempt to push it out of the way, according to Gensel.
The problem is nobody's really sure what EternalRocks does, since it hasn't been activated yet.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'activate'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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 plasminogenb: 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 1999c: to make (a substance) radioactive
activation\ˌak-tə-ˈvā-shən\ play noun
Seen and Heard
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