the act of rotating; a turning around as on an axis.
the movement or path of the earth or a heavenly body turning on its axis.
one complete turn of such a body.
regularly recurring succession, as of officials.
Agriculture, crop rotation.
an operation that rotates a geometric figure about a fixed point.
curl ( def 17 ).
Pool. a game in which the balls are played in order by number.

1545–55; < Latin rotātiōn- (stem of rotātiō) a rotation, rolling, equivalent to rotāt(us) (see rotate1) + -iōn- -ion

rotational, adjective
nonrotation, noun
nonrotational, adjective
unrotational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rotation (rəʊˈteɪʃən)
1.  the act of rotating; rotary motion
2.  a regular cycle of events in a set order or sequence
3.  a planned sequence of cropping according to which the crops grown in successive seasons on the same land are varied so as to make a balanced demand on its resources of fertility
4.  maths
 a.  a circular motion of a configuration about a given point or line, without a change in shape
 b.  a transformation in which the coordinate axes are rotated by a fixed angle about the origin
 c.  another name for curl Abbreviation (for sense 4c): rot
5.  a.  Compare revolution the spinning motion of a body, such as a planet, about an internal axis
 b.  one complete turn in such motion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1555, from L. rotationem (nom. rotatio), noun of action from rotare "revolve, roll," from PIE *roto- (see rotary). Verb rotate is an 1808 back-formation. Rotator "muscle which allows a part to be moved circularly" is recorded from 1676.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rotation ro·ta·tion (rō-tā'shən)

  1. The act or process of turning around a center or an axis.

  2. Regular and uniform variation in a sequence or series, as in the recurrence of symptoms of a disease.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
rotation   (rō-tā'shən)  Pronunciation Key 
  1. The motion of an object around an internal axis.

  2. A single complete cycle of such motion. See Note at revolution.

  3. A transformation of a coordinate system in which the new axes have a specified angular displacement from their original position while the origin remains fixed.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In empire, there was an alternative: incompetent rulers could be removed, and
  there was a rotation of people.
Similarly, her rotation slows when she extends her arms at the conclusion of
  the spin.
When the moon is farther away, the axis rotation kind of gets behind the moon's
  orbital motion.
When a pitcher throws a knuckleball, the ball has no rotation and appears to
Image for rotation
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