modal logic modal auxiliary verb • modal value · · · Info · Definitions · Characters · · modal logic · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) the logical study of necessity and possibility. Synonyms: modal logic. · · Noun Definition 1 (noun) a system of logic whose formal properties resemble certain moral and epistemological concepts. Synonyms: modal logic. · · Noun Definition 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F