annihilational is an adjective that describes something related to Annihilation. Annihilation can have two meanings: one is the complete and total destruction of something by causing so much damage that it cannot be repaired or no longer exists; the other is the reaction in which a particle and its antiparticle collide and disappear, releasing energy and producing other particles . For example, one can say that a nuclear bomb has an annihilational effect on a city, or that an electron and a positron undergo annihilational interaction when they meet.

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