/rəʊ'teɪʃn; ro`teʃən/
n
1 (a) [U] rotating or being rotated 旋转; 转动
*the rotation of the Earth 地球的自转.
(b) [C] one complete movement of this type （旋转的）一圈; （一）转
*five rotations per hour 每小时旋转五圈.
2 [C, U] regular organized sequence of things or events 轮流; 轮换
*the rotation of crops/crop rotation, ie varying the crops grown each year on the same land to avoid exhausting the soil 作物的轮作[轮种].
3 (idm 习语) in rotation in turn; in regular succession 轮流地; 轮番地; 循环地
*The chairmanship of the committee changes in rotation. 委员会主席一职是轮流担任的.

n
[U]
when something turns with a circular movement around a central point
rotation of
　the rotation of the Earth on its axis
rotation about/around
　the planet's rotation around the sun
[C]
one complete circular turn around a central point
= revolution
　The blades spin at 100 rotations per minute.
[U]
the practice of regularly changing the thing that is being used or done, or the person who does a particular job
　job rotation
in rotation
　Three plays will be performed in rotation during the drama festival.
[C]AmE
a period of time spent doing a particular job, when you will soon change to a different job for the same employer
　a young doctor on a rotation in the children's ward
[C]AmE
the people who each take a turn to do a particular job in a regular order
　The rotation included two rookies, Hernandez and Saunders.
>rotationaladj