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relative permittivity
relative pitch
relative pronoun
relative strength
relative wind
relatively
relativise
relativism
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relative atomic mass
rel·a·tive a·tom·ic mass (plural rel·a·tive a·tom·ic mass·es)


noun 
Definition:
 
ratio of atom's mass to carbon-12: the ratio of the average mass per atom of an element to one twelfth of the mass of a carbon-12 atom.
Symbol  Ar
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