(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 | the property of a body that causes it to have weight in a gravitational field |
| the property of something that is great in magnitude |
| the common people generally |
| an ill-structured collection of similar things (objects or people) |
| a body of matter without definite shape |
| (often followed by `of') a large number or amount or extent |