from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The physical mass of a body when it is regarded as being at rest.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the mass of a body when it is not moving relative to an observer

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body


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