- to make active; cause to function or act.
- 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.
- to make (carbon, a catalyst, molecules, etc.) more active.
- to hasten (reactions) by various means, as heating.
- to place (a military unit or station) on an active status in an assigned capacity.
Origin of activate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- to make active or capable of action
- physics to make radioactive
- to increase the rate of (a reaction)
- to treat (a substance, such as carbon or alumina) so as to increase powers of adsorption
- physiol to prepare by arousal (the body or one of its organs (e.g. the brain)) for action
- to purify (sewage) by aeration
- US military to create, mobilize, or organize (a unit)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for unactivated
Online Etymology Dictionary, © 2010 Douglas Harper