- 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.
- the process in which a particle and antiparticle unite, annihilate each other, and produce one or more photons.
- the conversion of rest mass into energy in the form of electromagnetic radiation.
- total destruction
- the act of annihilating
- 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
