heterosexuality heterosexual • heteroside · · · Info · Definitions · Synonyms · Characters · · heterosexuality · · Text Latin · · Script 15 · · Length Definitions · · · (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex. Synonyms: heterosexualism, straightness. · · Noun Definition 1 Synonyms · · · heterosexualism · · Synonym 1 straightness · · Synonym 2 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075 x latin small letter x U+0078 y latin small letter y U+0079