WordReference Random House Unabridged Dictionary of American English © 2026
gravitational mass, [Physics.]
  1. Physicsthe mass of a body as measured by its gravitational attraction for other bodies. Cf. inertial mass.

Collins Concise English Dictionary © HarperCollins Publishers::
gravitational mass n
  1. the mass of a body determined by its response to the force of gravity
    Compare inertial mass
WordReference Random House Unabridged Dictionary of American English © 2026
inertial mass, [Physics.]
  1. Physicsthe mass of a body as determined by the second law of motion from the acceleration of the body when it is subjected to a force that is not due to gravity.
  2. Physicsthe measure of the property of inertia. Cf. Eötvös experiment, inertia (def. 2a), gravitational mass. 

'gravitational mass' also found in these entries (note: many are not synonyms or translations):

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