Definitions of rotation:

• noun:   the act of rotating as if on an axis

  Example: "The rotation of the dancer kept time with the music"

• noun:   a planned recurrent sequence (of crops or personnel etc.)

  Example: "Crop rotation makes a balanced demand on the fertility of the soil"

• noun:   a single complete turn (axial or orbital)

  Example: "The plane made three rotations before it crashed"

• noun:   (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin