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Definition of atomic mass noun from the Oxford Advanced Learner's Dictionary

atomic mass

noun

/əˌtɒmɪk ˈmæs/

/əˌtɑːmɪk ˈmæs/

(also relative atomic mass, atomic weight)

(chemistry)

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the average mass of all the naturally occurring atoms of a chemical element

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See atomic mass in the Oxford Advanced American Dictionary

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