Tidal-force meaning

A differential gravitational force acting along an extended body as a result of the varying distance from a gravitational source to the different parts of the body, such as the force of the moon on the earth's oceans closest to and farthest from the moon.
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A secondary effect of the gravitational forces between two objects orbiting each other, such as the Earth and the Moon, that tends to elongate each body along the axis of a line connecting their centers. Tidal forces are responsible for the fluctuation of the tides as well as for the synchronous rotation of certain moons as they orbit their planets.
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(physics) Any of various gravitational forces acting on a body caused by variation in the distance between it and a source of a gravitational field; such forces due to the Moon are responsible for tides.
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