alter ego alter • alterability · · · Info · Definitions · Characters · · alter ego · · Text Common · · Latin · · Scripts 9 · · Length 4 · · Syllables Definitions · · · (noun) a very close and trusted friend who seems almost a part of yourself. Synonyms: alter ego. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074