Atomic Weight Definition

noun
The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic mass units.
American Heritage
The weight of one atom of an element expressed in atomic mass units: it is the average weight of all the isotopes of the element.
Webster's New World

Former term for the more specific relative atomic mass.

Wiktionary

A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope.

Wiktionary
Attributive form of atomic weight.
Atomic-weight data.
Wiktionary
Synonyms:

Other Word Forms of Atomic Weight

Noun

Singular:
atomic weight
Plural:
atomic-weights

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atomic weight