relativistic mass (r l  -t-v s tk) In Special and General Relativity, the observed mass of an object moving with respect to the observer. The relativistic mass is a function of the rest mass and the velocity of the object. Compare rest mass. |
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| Noun | 1. | relativistic mass - (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 mass - the property of a body that causes it to have weight in a gravitational field natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics" |
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