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inertia (n.)

1713, "that property of matter by virtue of which it retains its state of rest or of uniform rectilinear motion so long as no foreign cause changes that state" [Century Dictionary], introduced as a term in physics 17c. by German astronomer and physician Johann Kepler (1571-1630) as a special sense of Latin inertia "unskillfulness, ignorance; inactivity, idleness," from iners (genitive inertis) "unskilled; inactive" (see inert). Also sometimes vis inertia "force of inertia." Used in 1687 by Newton, writing in Modern Latin. The classical Latin sense of "apathy, passiveness, inactivity" is attested in English from 1822.

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Definitions of inertia from WordNet

inertia (n.)
a disposition to remain inactive or inert;
he had to overcome his inertia and get back to work
Synonyms: inactiveness / inactivity
inertia (n.)
(physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force;
From wordnet.princeton.edu