(intransitive) To publicize something by publishing and distributing circulars. / (transitive) To distribute a circular or circulars to. / To canvass opinion by using a questionnaire.

Of or pertaining to a circulation, especially to the circulatory system. / Circular; going round.

(chemistry) A vessel with two portions unequally exposed to heat, and with connecting pipes or passages, through which the fluid rises from the overheated portion, and descends from the relatively colder, maintaining a circulation.

(idiomatic) To make a complete change or reform. / (idiomatic) To complete a cycle of transition, returning to where one started after gaining experience or exploring other things.

(meteorology) A luminous halo, each side of the sun parallel to the horizon, caused by refraction of sunlight through ice crystals.

(physiology) The parts of an animal body comprising the heart, blood vessels (arteries, veins, and capillaries), and blood, which circulate the blood around the body.

The non-SI unit for measuring the cross-sectional area of an electrical conductor: 1 CM= area of a circle having diameter of 0.001 inch; use capitals to distinguish from centimeter; 0.000 506 7 sq millimeters.

An electric circuit.

(electricity) An electrical switch capable of opening and closing an electrical circuit in all operating conditions, including fault situations.

In no case, whatever happens; never.