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precession Definition

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precession
noun(pre-ces-sion)
a comparatively slow gyration of the rotation axis of a spinning body about another line intersecting it so as to describe a cone
precession
noun phrase(pre-ces-sion)
a slow westward motion of the equinoxes along the ecliptic caused by the gravitational action of sun and moon upon the protuberant matter about the earth's equator

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