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relational grammar
relationship
relative
relative atomic mass
relative clause
relative density
relative humidity
relative income hypothesis
relative molecular mass
relative performance compensation
relative permeability
relative permittivity
relative pitch
relative pronoun
relative strength
relative wind
relatively
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relative molecular mass
rel·a·tive mo·lec·u·lar mass


noun 
Definition:
 
( technical )
Same as  molecular weight
Symbol  Mr
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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