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Orbital motion about a point, especially as distinguished from axial rotation: the planetary revolution about the sun.
(noun)
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A turning or rotational motion about an axis.
(noun)
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A single complete cycle of such orbital or axial motion.
(noun)
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The overthrow of one government and its replacement with another.
(noun)
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A sudden or momentous change in a situation: the revolution in computer technology.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.