perpetual motion

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Definitions from WordNet

Noun perpetual motion has 1 sense

perpetual motion - motion that continues indefinitely without any external source of energy; impossible in practice because of friction
--₁ is a kind of motion

Definitions from the Web

Perpetual Motion

Definition: Perpetual motion refers to the hypothetical concept of a motion that continues indefinitely without any external energy source.

Examples:

The concept of perpetual motion has fascinated scientists and inventors for centuries.
According to the laws of thermodynamics, perpetual motion machines are deemed impossible.

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