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say it: FISH-uhn
fission is a noun meaning "reproduction of some unicellular organisms by division of the cell into two more or less equal parts". It carries 2 recorded senses.
reproduction of some unicellular organisms by division of the cell into two more or less equal parts
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
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 fission 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.