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To set in motion; make active or more active.
(verb-transitive)
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To organize or create (a military unit, for example): activate the National Guard.
(verb-transitive)
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To treat (sewage) with aeration and bacteria to aid decomposition.
(verb-transitive)
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Chemistry To accelerate a reaction in, as by heat.
(verb-transitive)
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Physics To make (a substance) radioactive.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.