(n) (physics) the 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
(n) a coordinate system in which Newton's first law of motion is valid, Syn. inertial frame
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Inertial system
(n) a frame of reference in which a body remains at rest or moves with constant linear velocity unless acted upon by forces: any frame of reference that moves with constant velocity relative to an inertial system is itself an inertial system. Also called inertial reference frame. Expand. Compare law of motion.