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inertial observer

noun

a hypothetical observer who is not accelerated with respect to an inertial system. Newton's laws of motion and the special theory of relativity apply to the measurements which would be made by such observers

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having or claiming to have the power of seeing objects or actions beyond the range of natural vision.
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Words nearby inertial observer

inertial force, inertial frame, inertial fusion, inertial guidance, inertial mass, inertial observer, inertial platform, inertial system, inertial upper stage, inertia-reel seat belt, inertia selling
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