| 释义 |
ro·ta·tion
I. \rōˈtāshən\ noun
(-s)
Etymology: Latin rotation-, rotatio, from rotatus (past participle of rotare to rotate) + -ion-, -io -ion
1.
a. : the act of turning about an axis or a center
< the rotation of a shaft >
< the rotation of the earth about the sun >
< body rotation in slalom skiing >
— see dextrorotation, levorotation, specific rotation; compare optical rotation, polarization, revolution
b. : one complete turn : the angular displacement required to return a rotating body or figure to its original orientation — called also revolution
2.
a. : return or succession in a series
< the rotation of the seasons >
< retired by rotation >
b. : the action of placing in succession in a series
< the resolution provided for rotation of the chairmanship — Vera M. Dean >
3. : the growing of different crops in succession on one field usually in regular sequence
4. : the turning of a limb or other body part about its long axis as if on a pivot
< rotation of the head to look over the shoulder >
5. : the time required or estimated to be required to bring timber crops to a specified state of maturity
6. : the direction in which the turn to deal, bid, and play passes from player to player in a card game
7. : the exchange of individuals or units with personnel more comfortably situated
< was due for rotation back home soon — Marcus Duffield >
8. also rotation pool : fifteen-ball pool in which the object balls are played upon in numerical order
II. noun
: the series of pitchers on a baseball team who regularly start successive games in turn |