Simple Definition of annihilate
: to destroy (something or someone) completely
: to defeat (someone) completely
Full Definition of annihilate
1 a : to cause to be of no effect : nullify b : to destroy the substance or force of
2 : to regard as of no consequence
3 : to cause to cease to exist; especially : kill
4 a : to destroy a considerable part of <bombs annihilated the city> b : to vanquish completely : rout <annihilated the visitors 56–0>
5 : to cause (a particle and its antiparticle) to vanish by annihilating
of a particle and its antiparticle : to vanish or cease to exist by coming together and changing into other forms of energy (as photons)
annihilationplay \-ˌnī-ə-ˈlā-shən\ noun
annihilatorplay \-ˌlā-tər\ noun
annihilatoryplay \-ˈnī-ə-lə-ˌtȯr-ē\ adjective
Examples of annihilate in a sentence
The enemy troops were annihilated.
He annihilated his opponent in the last election.
Origin and Etymology of annihilate
Late Latin annihilatus, past participle of annihilare to reduce to nothing, from Latin ad- + nihil nothing — more at nil
First Known Use: 1525
ANNIHILATE Defined for Kids
Definition of annihilate for Students
: to destroy completely
Seen and Heard
What made you want to look up annihilate? Please tell us where you read or heard it (including the quote, if possible).