1 A center of actual rotation as well as rotational symmetry may be called gyration center.
2 The rotation of the dancer kept time with the music.
3 Crop rotation helps prevent soil erosion.
4 It is best to allow the rotor to rotate freely.
5 The blades rotate around a central point.
6 Stay well away from the helicopter when its blades start to rotate.
7 We rotate the crops so as to maximize the use of the soil.
8 In physics, a torque is a vector that measures the tendency of a force to rotate an object about some axis.
9 The concept of long term rotational antibiotics for acne is outdated and this practice should be avoided.