- noun a large quantity or large number
- The quantity of matter in a body or medium. The mass of a body makes it resist acceleration, and gives it gravitational attraction. Its SI unit is the kilogram, and its symbol is m. The weight (1) of an object varies depending on the gravitational force exerted upon it, while its mass does not.
- A given body of matter.
- A large or very large amount.
- The principal part of something.
- symbol m
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