annihilation
[ uh-nahy-uh-ley-shuh n ]
/ 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.
- 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.
Origin of annihilation
Words nearby annihilation
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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