rotation

(noun) the act of rotating as if on an axis. Synonyms: rotary motion. Example: "The rotation of the dancer kept time with the music."

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

(noun) a single complete turn (axial or orbital). Synonyms: revolution, gyration. Examples: "The plane made three rotations before it crashed." "The revolution of the earth about the sun takes one year."

(noun) a planned recurrent sequence (of crops or personnel etc.). Examples: "Crop rotation makes a balanced demand on the fertility of the soil." "The manager had only four starting pitchers in his rotation."