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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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