legitimacy legitim • legitimate · · · Info · Definitions · Synonyms · Antonyms · Characters · · legitimacy · · Text Latin · · Script 10 · · Length Definitions · · · (noun) lawfulness by virtue of being authorized or in accordance with law. · · Noun Definition 1 (noun) undisputed credibility. Synonyms: authenticity, genuineness. · · Noun Definition 2 Synonyms · · · authenticity · · Synonym 1 genuineness · · Synonym 2 Antonyms · · · illegitimacy · · Antonym 0 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 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 t latin small letter t U+0074 y latin small letter y U+0079