- (PHYSICS) The turning or spinning
of a body, such as a planet, star, or galaxy, about an axis running
through it. See also rotational period.
- (MATH) A transformation
in which a figure turns through a specific angle about a fixed point,
called the center of rotation. The center of rotation
may be inside or outside the figure that is being transformed. If the
figure is turned anticlockwise, the rotation is considered positive,
while a negative rotation turns the figure clockwise.