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The Collaborative International Dictionary of English v.0.48 (gcide)

deactivate \de*ac"ti*vate\, v. t.
1. To make inactive; to render ineffective; as, to deactivate
a bomb; to deactivate a machine; to deactivate the alarm.

Note: The deactivation of a machine or device is usually a
reversible process; switching off an electrical device
may be referred to as deactivation. To render an enzyme
or catalyst ineffective is more commonly referred to as
to {inactivate}.
[PJC]

2. To disband (a military unit, or other group); to
discontinue (a group activity); as, to deactivate the
regiment; to deactivate the investigation.
[PJC]