in·er·tia ( -nûr sh )n. 1. Physics The tendency of a body to resist acceleration; 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. 2. Resistance or disinclination to motion, action, or change: the inertia of an entrenched bureaucracy. [Latin, idleness, from iners, inert-, inert; see inert.] in·er tial adj.in·er tial·ly adv. |
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| Adj. | 1. | inertial - of or relating to inertia |
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