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annihilation
[uh-nahy-uh-ley-shuh n]
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Examples Word Origin
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.
Also called pair annihilation. the process in which a particle and antiparticle unite, annihilate each other, and produce one or more photons.
Compare positronium.
the conversion of rest mass into energy in the form of electromagnetic radiation.