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
• Topics: ↑physics, ↑natural philosophy
• Hypernyms: ↑mass
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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.
Useful english dictionary. 2012.