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Relative atomic mass

dimensionless physical quantity: ratio of the average mass of atoms of an element (in each sample) to one unified atomic mass unit. The unified atomic mass unit, symbol u, is defined being  1⁄12 of the mass of a carbon-12 atom

Pronunciation
/ˈrɛlədɪv əˈtɑmɪk mæs/
/ˈrɛlətɪv əˈtɒmɪk mas/