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WordReference Random House Unabridged Dictionary of American English © 2024iner′tial sys′tem, [Physics.]- Physicsa 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 iner′tial ref′erence frame′. Cf. law of motion.
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