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inertial system

noun, 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 inertial reference frame.
Compare law of motion.
Origin of inertial system
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for inertial system

inertial system

a frame of reference within which bodies are not accelerated unless acted upon by external forces Also called inertial reference frame
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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