[ro.ta.tion] n (1555) 1 a (1): the action or process of rotating on or as if on an axis or center (2): the act or an instance of rotating something b: one complete turn: the angular displacement required to return a rotating body or figure to its original orientation
2. a: return or succession in a series "~ of the seasons" b: the growing of different crops in succession in one field usu. in a regular sequence
3: the turning of a body part about its long axis as if on a pivot
4: a game of pool in which all 15 object balls are shot in numerical order
5: the series of pitchers on a baseball team who regularly start successive games in turn -- ro.ta.tion.al adj