identification number identification mark • identification particle · · · Info · Definitions · Synonyms · Characters · · identification number · · Text Common · · Latin · · Scripts 21 · · Length 8 · · Syllables Definitions · · · (noun) a numeral or string of numerals that is used for identification. Synonyms: number, identification number. Example: "She refused to give them her social security number." · · Noun Definition 1 Synonyms · · · number · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075