Annihilation | Definition of Annihilation at Dictionary.com

annihilation

[ uh-nahy-uh-ley-shuhn ]
/ əˌnaɪ əˈleɪ ʃən /

noun

an act or instance of annihilating, or of completely destroying or defeating someone or something: the brutal annihilation of millions of people.
the state of being annihilated total destruction; extinction: fear of nuclear annihilation.
Physics.
  1. Also called pair annihilation . the process in which a particle and antiparticle unite, annihilate each other, and produce one or more photons.Compare positronium.
  2. the conversion of rest mass into energy in the form of electromagnetic radiation.

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Origin of annihilation

First recorded in 1630–40; from French or directly from Late Latin annihilātiōn- (stem of annihilātiō ); see origin at annihilate, -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for annihilation

British Dictionary definitions for annihilation

annihilation
/ (əˌnaɪəˈleɪʃən) /

noun

total destruction
the act of annihilating
physics the destruction of a particle and its antiparticle when they collide. The annihilation of an electron with a positron generates two or, very rarely, three photons of annihilation radiation . The annihilation of a nucleon with its antiparticle generates several pions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012