say it: uh-nahy-uh-LAY-shuhn
annihilation is a noun meaning "destruction by annihilating something". It carries 2 recorded senses.
destruction by annihilating something
total destruction
“bomb tests resulted in the annihilation of the atoll”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for annihilation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.