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Definition of Relativistic mass
1. Noun. (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases.
Definition of Relativistic mass
1. Noun. (physics) The increased mass of an object moving at relativistic speed relative to an observer. ¹
¹ Source: wiktionary.com