A swivel chair.

plural of rotating chair

plural of rotating beacon

The resultant magnetic field produced by coils symmetrically placed and supplied with polyphase electric current which is often used in electromechanical applications.

(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.