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Definition of tidal. 1a : of, relating to, caused by, or having tides tidal cycles tidal erosionb : periodically rising and falling or flowing and ebbing tidal waters. 2 : dependent (as to the time of arrival or departure) upon the state of the tide a tidal steamer.
The tides, which are caused by the gravitational forces between the Earth, the sun and the moon, produce tidal friction as they interact with the Earth. That drag adds about 2.3 milliseconds to our day every century [sources: Lunar and Planetary Institute, Ray]. Weather systems can change the Earth's rotation, with winds applying a braking force to the planet's surface.