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 for rotational
The starter motor converts the energy of the moving air to rotational torque.
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