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relative pitch
relative pronoun
relative strength
relative wind
relatively
relativise
relativism
relativistic
relativistic mass
relativistic quantum theory
relativity
relativize
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relativistic mass
rel·a·tiv·is·tic mass


noun 
Definition:
 
mass of a fast-moving particle: the mass of a particle moving at a speed that is a significant fraction of the speed of light. It is greater than the particle's mass when at rest.
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