fission fissility • fission alga · · · Info · Definitions · Synonyms · Characters · · fission · · Text Latin · · Script 7 · · Length 2 · · Syllables Definitions · · · (noun) reproduction of some unicellular organisms by division of the cell into two more or less equal parts. · · Noun Definition 1 (noun) a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy. Synonyms: nuclear fission. · · Noun Definition 2 Synonyms · · · nuclear fission · · Synonym 1 Characters · · f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073