Pronunciation: (u-nī'u-lāt"),[key] —v.t.,-lat•ed, -lat•ing. 1. to reduce to utter ruin or nonexistence; destroy utterly: The heavy bombing almost annihilated the city. 2. to destroy the collective existence or main body of; wipe out: to annihilate an army. 3. to annul; make void: to annihilate a law. 4. to cancel the effect of; nullify.
5. to defeat completely; vanquish: Our basketball team annihilated the visiting team.