Definitions
1.nounThe act of turning around a centre or an axis."The earth's rotation about its axis is responsible for its being slightly oblate rather than a sphere."
2.nounA single complete cycle around a centre or an axis."Earth's moon completes a rotation every twenty-seven days or so."
3.nounA regular variation in a sequence, such as to even-out wear, or people taking turns in a task; a duty roster."In rotation, each member of the group would be responsible for the beacon fire."
4.nounAn operation on a metric space that is a continuous isometry and fixes at least one point."The function mapping (x,y) to (−y,x) is a rotation."
5.nounThe set of starting pitchers of a team.
6.nounThe step during takeoff when the pilot commands the vehicle to lift the nose wheel off the ground during the takeoff roll. (see also: V2)
7.nounRepeated play on a radio station, etc."The new single enjoyed heavy rotation on MTV."