(epistemology, countable) A circle of (foundational) epistemic arguments where the reliability of a device used within this circle is also proven within the circle.

(idiomatic, humorous) The trash container; the wastebasket.

(semantics) A definition relying directly or indirectly on the term being defined.

(geometry) A continuous section of the circumference of a circle.

(chemistry, physics) the differential absorption of left-handed and right-handed circularly polarized light

(trigonometry) Synonym of trigonometric function

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.

(fencing): a defensive move in fencing; a parry in which the blade moves in a circle to block an opponent's attack from the opposite side from which it started (sometimes called a contra- or counter-parry)

A power saw with a circular cutting blade, whose teeth rotate rapidly.

plural of circular arc