[in-ur-shuh, ih-nur-] /ɪnˈɜr ʃə, ɪˈnɜr-/

inertness, especially with regard to effort, motion, action, and the like; inactivity; sluggishness.

Medicine/Medical. lack of activity, especially as applied to a uterus during childbirth when its contractions have decreased or stopped.
/ɪnˈɜːʃə; -ʃɪə/
the state of being inert; disinclination to move or act


1737, from inertia + -al (1).

1713, introduced as a term in physics 17c. by German astronomer and physician Johann Kepler (1571-1630), from Latin inertia “unskillfulness, idleness,” from iners (genitive inertis) “unskilled, inactive;” see inert. Used in Modern Latin by Newton (1687). Sense of “apathy” first recorded 1822.

inertia in·er·tia (ĭ-nûr’shə)

The resistance of a body to changes in its momentum. Because of inertia, a body at rest remains at rest, and a body in motion continues moving in a straight line and at a constant speed, unless a force is applied to it. Mass can be considered a measure of a body’s inertia. See more at Newton’s laws of motion, See also mass.
inertia [(i-nur-shuh)]

In physics, the tendency for objects at rest to remain at rest, and for objects in uniform motion to continue in motion in a straight line, unless acted on by an outside force. (See Newton’s laws of motion.)


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