Noun annihilation has 2 senses
  1. annihilation, obliteration - destruction by annihilating something
    --1 is a kind of destruction, devastation
    --1 has particulars:
     atomization, atomisation; pulverization, pulverisation; vaporization, vaporisation
    Derived form: verb annihilate1
  2. annihilation, disintegration - total destruction; "bomb tests resulted in the annihilation of the atoll"
    --2 is a kind of destruction, demolition, wipeout
    --2 has particulars: extinction, extermination
    Derived form: verb annihilate1