relative atomic mass relative • relative clause · · · Info · Definitions · Synonyms · Characters · · relative atomic mass · · Text Common · · Latin · · Scripts 20 · · Length 7 · · Syllables Definitions · · · (noun) (chemistry) the mass of an atom of a chemical element expressed in atomic mass units. Synonyms: atomic mass, atomic weight, relative atomic mass. · · Noun Definition 1 Synonyms · · · atomic mass · · Synonym 1 atomic weight · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 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 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076