| NOUN | attribute | relativistic mass | (physics) the mass of a body in motion relative to the observer |
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| Meaning | (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. | |
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| Category | physics, natural philosophy | The science of matter and energy and their interactions |
| Broader | mass | The property of a body that causes it to have weight in a gravitational field |
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