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iner'tial sys'tem



Physics.
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 iner'tial ref'erence frame". Cf. law of motion.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

inertial massinertial upper stage

 

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