## ROTATION

### Rotation

A rotation is a circular movement of an object around a center of rotation. A three-dimensional object rotates always around an imaginary line called a rotation axis. If the axis is within the body, and passes through its center of mass the body is said to rotate upon itself, or spin. A rotation about an external point, e.g. the Earth about the Sun, is called a revolution or orbital revolution, typically when it is produced by gravity.

The above text is a snippet from Wikipedia: Rotation

### rotation

#### Noun

1. The 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. A single complete cycle around a centre or an axis.
Earth's moon completes a rotation every twenty-seven days or so.
3. A regular variation in a sequence.
crop rotation
The medical resident finished a two-week rotation in pediatrics and began one in orthopaedics.
4. An isometry that fixes precisely one point.
The function mapping (x,y) to (−y,x) is a rotation.
5. The set of of a team.
6. The step during takeoff when the pilot commands the vehicle to lift the nose wheel off the ground during the takeoff roll.

The above text is a snippet from Wiktionary: rotation