circular breathing noun

A technique used in playing a wind instrument, in which a phrase is sustained by forcing air out of the mouth while breathing through the nose

circular file noun (computing)

A file in which each item has a pointer to the next, the last leading back to the first

circular function noun

Any of the trigonometrical functions with argument in radians

circular letter noun

A letter of which copies are sent to several persons

circular measure noun

The reckoning of angles in radians

circular note noun

A former letter of bank credit addressed to foreign bankers for the use of a traveller, being a kind of bill personal to the bearer

circular polarization noun (telecommunications)

An electromagnetic wave for which either the electric or magnetic field vector describes a circle at the wave frequency, used in satellite communications

circular saw noun

A power-driven saw in the shape of a flat disc with a serrated edge

circular velocity noun

The horizontal velocity of a body required to keep it in orbit, at a given altitude, around a planet