annihilation

/əˌnaɪəˈleɪʃən/
noun
  1. Complete destruction or elimination of something, so that nothing is left.
    • The army's goal was the annihilation of the enemy forces.
    • Scientists worry about the annihilation of entire species due to climate change.
    • The bomb caused the total annihilation of the small town.
  2. A decisive defeat in a competition or conflict.
    • The company faced financial annihilation after the lawsuit.
    • The home team suffered annihilation in the championship game, losing 10–0.
    • The debate ended in the annihilation of the opposing argument.
  3. In physics, the process in which a particle and its antiparticle collide and convert entirely into energy.
    • When matter and antimatter meet, they undergo annihilation, releasing huge amounts of energy.
    • Annihilation reactions are studied to understand the early universe.
    • The experiment observed the annihilation of an electron and a positron.
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