(physics) An interaction between a polarized electromagnetic pulse, such as a beam of light, and a magnetic field, in which the plane of polarization is rotated in proportion to the intensity of the component of the magnetic field in the direction of travel of the pulse.

plural of axis of rotation

rotational period

(of an astronomic object) The time taken to rotate about its axis relative to the background stars.

(physics) The kinetic energy of a rotating rigid body otherwise at rest.

The rotary, rather than propulsive, motion produced by a propeller. / (mechanics) The rotation of the inner and outer parts of a bearing race.

(chemistry, of a compound) [α]_D, the angle of rotation of the plane of polarization of a ray of monochromatic light that passes through 10cm of the substance in solution at a concentration of 1 gram per millilitre

The axis about which any body rotates. / The line joining the North Pole and South Pole about which the Earth rotates daily.

(agriculture) A farming practice in which the same land is used to grow different crops in successive seasons or years (when once the land would have been left fallow); used to prevent erosion and increase fertility.

The practice of having passengers eat in several different restaurants during a cruise.