inertial

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in·er·tia

 (ĭ-nûr′shə)
n.
1. Physics The tendency of a body at rest to remain at rest or of a body in straight line motion to stay in motion in a straight line unless acted on by an outside force; the resistance of a body to changes in momentum.
2. Resistance or disinclination to motion, action, or change: an entrenched bureaucracy's inertia.

[Latin, idleness, from iners, inert-, inert; see inert.]

in·er′tial adj.
in·er′tial·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.inertial - of or relating to inertia
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References in periodicals archive ?
For a world without gravity, he discusses non-relativity for relativists, the invariance of physical law under change of inertial frame of reference, using and understanding the Lorentz transformation, the measure of space-time, and electromagnetic theory in space-time.

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