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pair annihilation

noun
1.
Physics. annihilation (def 3a).

annihilation

[uh-nahy-uh-ley-shuh n] /əˌnaɪ əˈleɪ ʃən/
noun
1.
an act or instance of annihilating, or of completely destroying or defeating someone or something:
the brutal annihilation of millions of people.
2.
the state of being annihilated; total destruction; extinction:
fear of nuclear annihilation.
3.
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.
Origin
1630-1640
1630-40; (< F) < Late Latin annihilātiōn- (stem of annihilātiō). See annihilate, -ion
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pair-annihilation

annihilation

/əˌnaɪəˈleɪʃən/
noun
1.
total destruction
2.
the act of annihilating
3.
(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
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Word Origin and History for pair-annihilation

annihilation

n.

1630s, from Middle French annihilation (restored from Old French anichilacion, 14c.), or directly from Late Latin annihilationem (nominative annihilatio), noun of action from past participle stem of annihilare (see annihilate).

Online Etymology Dictionary, © 2010 Douglas Harper
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6
7
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