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The Collaborative International Dictionary of English v.0.48:

inactivate \inactivate\ v. t. [imp. & p. p. inactivated; p. pr. & vb. n. inactivating.] to make inactive; as, boiling will inactivate most enzymes; acetylation of the antibiotic inactivated it. Syn: deactivate. [WordNet 1.5 +PJC] Note: To inactivate an enzyme or chemical usually renders it permanently inactive; to inactivate a machine (as by turning a switch) may be reversible, and for machines and devices, the term deactivate is usually used. The distinction is worth preserving. [PJC]