Definition of "Rotation" :

noun: the act of rotating as if on an axis

"The rotation of the dancer kept time with the music."

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

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

noun: a single complete turn (axial or orbital)

"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