Definitions for relative atomic mass
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Princeton's WordNet
atomic mass, atomic weight, relative atomic mass(noun)
(chemistry) the mass of an atom of a chemical element expressed in atomic mass units
Wiktionary
relative atomic mass(Noun)
Ratio of the atomic mass of one atom of an isotope to 1/12 (one twelfth) the mass of a Carbon-12 atom.
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"relative atomic mass." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/relative atomic mass>.

