# rotation

[roh-tey-shuh n] /roʊˈteɪ ʃən/
noun
1.
the act of rotating; a turning around as on an axis.
2.
Astronomy.
1. the movement or path of the earth or a heavenly body turning on its axis.
2. one complete turn of such a body.
3.
regularly recurring succession, as of officials.
4.
Agriculture. crop rotation.
5.
Mathematics.
1. an operation that rotates a geometric figure about a fixed point.
2. curl (def 14).
6.
Pool. a game in which the balls are played in order by number.
7.
Baseball. pitching rotation.
Origin of rotation
1545-1555
1545-55; < Latin rotātiōn- (stem of rotātiō) a rotation, rolling, equivalent to rotāt(us) (see rotate1) + -iōn- -ion
Related forms
nonrotation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for rotational
Historical Examples
• Searching problems and discussion are instigated at once, and the notion of rotational equilibrium and force moments brought in.

Paul Klapper
• The rotational speed of Earth at this latitude is seven-seven-eight.

Murray Leinster
• Quantitative experiments are furnished by the rotational counterpart of the Atwood machine.

Paul Klapper
• The total, however, of the rotational moment of momentum of the system barely reaches two per cent.

Robert S. (Robert Stawell) Ball
• This rotational motion is also found in the nebul and star clusters as well as in the stars and planets.

Isabel Martin Lewis
• What, then, is the effect of the rotational velocity of the surface of the earth on the atmosphere near to it?

William George Hooper
• How can one who is ignorant of the existence and characteristics of rotational inertia understand a galvanometer?

Paul Klapper
• It is important to distinguish between two types of strain: the “rotational” type and the “irrotational” type.

• By this time the student should have found himself sufficiently prepared to take up problems of rotational motion.

Paul Klapper
• At the same time the tidal influence of the earth was lessening the rotational movement of the moon.

Joseph McCabe
British Dictionary definitions for rotational

## rotation

/rəʊˈteɪʃən/
noun
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)
1. a circular motion of a configuration about a given point or line, without a change in shape
2. a transformation in which the coordinate axes are rotated by a fixed angle about the origin
3. another name for curl (sense 11) Abbreviation (for sense 4c) rot
5.
1. the spinning motion of a body, such as a planet, about an internal axis Compare revolution (sense 5a)
2. one complete turn in such motion
Derived Forms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rotational

1852, from rotation + -al (1).

## rotation

n.

1550s, from Latin rotationem (nominative rotatio) "a turning about in a circle," noun of action from past participle stem of rotare "turn round, revolve, whirl about, roll," from PIE *roto- (see rotary).

Online Etymology Dictionary, © 2010 Douglas Harper
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rotational in Medicine

rotation ro·ta·tion (rō-tā'shən)
n.

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
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rotational in Science
 rotation   (rō-tā'shən)    The motion of an object around an internal axis.A single complete cycle of such motion. See Note at revolution.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
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