名詞 rotation:

1. the act of rotating as if on an axis
   同義詞：rotary motion
2. (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
3. a single complete turn (axial or orbital)
   同義詞：revolution, gyration
4. a planned recurrent sequence (of crops or personnel etc.)

1. An instrument used to measure the rotation of the plane of polarization of polarized light passing through an optical structure or sample.
   偏振計; 旋光計用來測量經(jīng)過光學(xué)結(jié)構(gòu)或樣品的極化光的偏振平面旋轉(zhuǎn)的一種儀器
2. The chairmanship of the committee changes in rotation.
   委員會主席一職是輪流擔(dān)任的。
3. The seasons follow each other in rotation.
   四季循環(huán)交替。
4. The rotation of crops keeps the soil healthy and fertile.
   谷物輪種使土壤保持了肥力和高質(zhì)。

ro.ta.tion

n.Abbr. rot.（名詞）縮寫 rot.

The act or process of turning around a center or an axis:
旋轉(zhuǎn)，轉(zhuǎn)動：繞中心或軸轉(zhuǎn)動的行為或過程：
例句：
the axial rotation of the earth.
地球繞軸自轉(zhuǎn)

A single complete cycle of such motion.
旋轉(zhuǎn)一圈
Mathematics 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.
【數(shù)學(xué)】 旋度：一種坐標(biāo)系的轉(zhuǎn)變，新的坐標(biāo)軸從原位置位移的一定角度而原點(diǎn)保持不變
Regular and uniform variation in a sequence or series:
輪換，輪作：在一個次序或序列中定期的變動：
例句：
a rotation of personnel; crop rotation.
員工的輪流替換；農(nóng)作物的輪作

Games An order of shooting balls in billiards in which the ball with the lowest number on the table is always pocketed first.
【游戲】 輪番臺球：臺球游戲中擊球的順序，其中球桌上數(shù)碼最小的球總是最先被擊落袋中

【引伸】
rota.tional
adj.（形容詞）