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[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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  • Inertial frame

    inertial frame A reference frame in which the observers are not subject to any accelerating force. In Special Relativity, time measurements in inertial frames that are not at rest with respect to each other are not equivalent; each inertial frame must have its own time coordinate, the value of which is the time as read […]

  • Inertial fusion

    noun 1. (physics) a type of nuclear fusion in which the inertia of matter enables it to fuse by impact, as by pulses of laser radiation or high-energy charged particles, rather than by high temperature

  • Inertial-guidance

    noun, Navigation. 1. a guidance system for an aerospace vehicle, in which self-contained devices determine the vehicle’s course on the basis of the directions and magnitudes of the accelerations it undergoes in flight. noun 1. a method of controlling the flight path of a missile by instruments contained within it. Velocities or distances covered, computed […]

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