Definition of Inertia

1. Noun. A disposition to remain inactive or inert. "He had to overcome his inertia and get back to work"

Exact synonyms: Inactiveness, Inactivity
Generic synonyms: Trait
Specialized synonyms: Flatness, Languor, Lethargy, Phlegm, Sluggishness, Restfulness, Passiveness, Passivity, Indolence, Laziness
Antonyms: Activeness
Derivative terms: Inactive, Inactive, Inactive

2. Noun. (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force.
Category relationships: Natural Philosophy, Physics
Specialized synonyms: Moment Of Inertia
Generic synonyms: Mechanical Phenomenon

Definition of Inertia

1. n. 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 inertiæ.

Definition of Inertia

1. Noun. (physics uncountable or countable) The property of a body that resists any change to its uniform motion; equivalent to its mass. ¹

2. Noun. (figuratively) In a person, unwillingness to take action. ¹

¹ Source:

Definition of Inertia

1. the tendency of a body to resist acceleration [n -TIAS or -TIAE] : INERTIAL [adj]

Medical Definition of Inertia

1. Inactivity, inability to move spontaneously. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Inertia

inert gas
inert gas narcosis
inert gases
inertia (current term)
inertia time
inertia welding
inertial confinement fusion
inertial frame
inertial frame of reference
inertial guidance
inertial guidance system
inertial navigation
inertial navigation system
inertial reference frame
inertial space

Literary usage of Inertia

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"The point usually chosen is the centre of inertia of the body-arid the investigation of its motion comes under the kinetics of a particle, which we have ..."

2. Mechanics: A Textbook for Engineers by James Ellsworth Boyd (1921)
"When the axis is in the plane of the section, the integral is equivalent to the moment of inertia of a plate so thin that the square of its thickness is ..."

3. Analytical Mechanics for Engineers by Fred B. Seely, Newton Edward Ensign (1921)
"If the moment of inertia is found with respect to a line through one end of ... Determine the moment of inertia of a steel cylinder 6 in. in diameter and 12 ..."

4. Proceedings of the Royal Society of Edinburgh by Royal Society of Edinburgh (1904)
"Dead' matter has two forms of inertia—that of rest (mass), and that of motion (momentum)—and it seems to me that living matter possesses a property, ..."

5. Science by American Association for the Advancement of Science (1884)
"It is a pity that Maxwell has not given us a definition of ' an inertia unit. ... In my article on ' inertia ' I was mainly concerned for the distinct ..."

6. The Design of Steel Mill Buildings and the Calculation of Stresses in Framed by Milo Smith Ketchum (1921)
"(1) inertia Ellipse.—Construct angle a, tan a = 0.241; and draw axes 3-3 and 4-4, which are the principal axes of the inertia ellipse. ..."

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