[dee-ak-tuh-veyt] 
verb, -vat⋅ed, -vat⋅ing.| 1. | to cause to be inactive; remove the effectiveness of. |
| 2. | to demobilize or disband (a military unit). |
| 3. | to render (a bomb, shell, or the like) inoperative, esp. by disconnecting, removing, or otherwise interfering with the action of the fuze. |
| 4. | Chemistry. to render (a chemical, enzyme, catalyst, etc.) inactive. |
| 5. | Physical Chemistry. to lose radioactivity. |
| de·ac·ti·vate (dē-āk'tə-vāt') tr.v. de·ac·ti·vat·ed, de·ac·ti·vat·ing, de·ac·ti·vates
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təˌveɪt