momentum

American  

[moh-men-tuhm] / moʊˈmɛn təm /

noun

plural

momenta, momentums

1. force or speed of movement; impetus, as of a physical object or course of events.

   The car gained momentum going downhill. Her career lost momentum after two unsuccessful films.

2. Also called linear momentum.  Mechanics. a quantity expressing the motion of a body or system, equal to the product of the mass of a body and its velocity, and for a system equal to the vector sum of the products of mass and velocity of each particle in the system.

3. Philosophy. moment.

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momentum British  

/ məʊˈmɛntəm /

noun

1.  p.  physics the product of a body's mass and its velocity See also angular momentum

2. the impetus of a body resulting from its motion

3. driving power or strength

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momentum Scientific  

/ mō-mĕn′təm /

plural

momenta

1. A vector quantity that expresses the relation of the velocity of a body, wave, field, or other physical system, to its energy. The direction of the momentum of a single object indicates the direction of its motion. Momentum is a conserved quantity (it remains constant unless acted upon by an outside force), and is related by Noether's theorem to translational invariance. In classical mechanics, momentum is defined as mass times velocity. The theory of Special Relativity uses the concept of relativistic mass. The momentum of photons, which are massless, is equal to their energy divided by the speed of light. In quantum mechanics, momentum more generally refers to a mathematical operator applied to the wave equation describing a physical system and corresponding to an observable; solutions to the equation using this operator provide the vector quantity traditionally called momentum. In all of these applications, momentum is sometimes called linear momentum.

2. See also angular momentum impulse

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momentum Cultural  

1. In physics, the property or tendency of a moving object to continue moving. For an object moving in a line, the momentum is the mass of the object multiplied by its velocity (linear momentum); thus, a slowly moving, very massive body and a rapidly moving, light body can have the same momentum. (See Newton's laws of motion.)

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Discover More

Figuratively, momentum can refer to the tendency of a person or group to repeat recent success: “The Bears definitely have momentum after scoring those last two touchdowns.”

Etymology

Origin of momentum

First recorded in 1690–1700; from Latin mōmentum; moment

Example Sentences

Despite all the momentum, just seven Wall Street firms—including none of the very largest investment banks—provide analyst coverage for Applied Optoelectronics.

From Barron's • Apr. 3, 2026

The case builds on recent momentum between China and the U.S. on counternarcotics.

From The Wall Street Journal • Apr. 3, 2026

And then after she read the script and agreed to participate, also getting involved as a producer, things gained momentum, adding cast members like Nivola based on her involvement.

From Los Angeles Times • Apr. 2, 2026

When momentum shifted in Chelsea's favour, Arsenal did not look rattled.

From BBC • Apr. 1, 2026

The more general version of Newton’s law is F = p, where p is an object’s momentum.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Related Words

• energy
• power
• strength