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