n. [ L. motare, motatum, to keep moving. ] The act of moving; motion. [ Obs. ] [ 1913 Webster ]

n. [ L. rotatio: cf. F. rotation. ] 1. The act of turning, as a wheel or a solid body on its axis, as distinguished from the progressive motion of a revolving round another body or a distant point; thus, the daily turning of the earth on its axis is a rotation; its annual motion round the sun is a revolution. [ 1913 Webster ]

2. Any return or succesion in a series. [ 1913 Webster ]

Moment of rotation. See Moment of inertia, under Moment. --
Rotation in office, the practice of changing public officers at frequent intervals by discharges and substitutions. --
Rotation of crops, the practices of cultivating an orderly succession of different crops on the same land. [ 1913 Webster ]

a. Pertaining to, or resulting from, rotation; of the nature of, or characterized by, rotation; as, rotational velocity. [ 1913 Webster ]