(chemistry, physics) the variation in the optical rotation of a substance with the wavelength of light

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

A member of a Rotary Club.

Capable of rotation.

(New England, Atlantic Canada) A roundabout, traffic circle. / (chiefly with initial capital) Any of the clubs making up the international Rotary International movement for community service.

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

(Singapore) A long rattan used to cane people as punishment for criminal acts.

(uncommon) Amur sleeper (Perccottus glenii)

(chemistry) any of a set of conformers that arise from restricted rotation around a single bond

Any of several types of internal combustion engine in which the power output is directly rotational.