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rostrum
Roswell
rosy
rosy periwinkle
rot
rot.
Rota
rota
rotable
Rotameter
Rotarian
rotary
Rotary Club
rotary cultivator
rotary engine
Rotary International
rotary mower
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rotation

ro·ta·tion [ rō táysh'n ] (plural ro·ta·tions)


noun 
Definition:
 
1. turning motion: a turning motion like that of a wheel around an axis or a fixed point, or the act or process of turning in such a way
the rotation of the Earth

2. single revolution: a single turn of something around an axis or a fixed point
one full rotation of the wheel

3. regular variation: a regular or planned recurrent sequence of events or changes of position
The families use the vacation home in strict rotation.

4. agriculture 
Same as  crop rotation


5. mathematics mathematical transformation: a mathematical transformation in which axes are rotated by a fixed angle while the origin remains unchanged

6. cue games way of playing pool: a way of playing pool in which the balls are shot in ascending numerical order

[15th century. Directly or via French< Latin rotation-< rotat- (see rotate)]

ro·ta·tion·al adjective
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