In*er"ti*a(?), n. [L., idleness, fr. iners idle. See Inert.]
(Physics) That property of matter by which it tends when at rest to remain so, and when in motion to continue in motion, and in the same straight line or direction, unless acted on by some external force; -- sometimes called
vis inerti. The
inertia of a body is proportional to its mass.
[1913 Webster +PJC]
2. Inertness; indisposition to motion, exertion, or action; lack of energy; sluggishness.
Men . . . have immense irresolution and inertia.Carlyle.
(Med.) Lack of activity; sluggishness; -- said especially of the uterus, when, in labor, its contractions have nearly or wholly ceased.
Center of inertia.
(Mech.) See under Center.
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Fri 18th October 2019