n. In elementary geom., a plane figure whose periphery is everywhere equally distant from a point within it, the center; in modern geom., the periphery of such a figure; a circumference.n. A circular formation or arrangement; a circlet; a ring: as, a circle of stones or of lights.n. A round body; a sphere; an orb.n. Circuit; course.n. Compass; inclosure.n. Something conceived as analogous to a circle; specifically, a number of persons intimately related to a central interest, person, or event; hence, a number of persons associated by any tie; a coterie; a set: as, a circle of ideas; to move in the higher circles of society; the circles of fashion; the family circle.n. A series ending where it begins, and perpetually repeated.n. A complete system, involving several subordinate divisions: as, the circle of the sciences.n. Circumlocution; indirect form of speech.n. In logic, an inconclusive form of argument, in which two or more unproved statements, or their equivalents, are used to prove each other: often called a vicious circle, or argument in a circle.n. The English equivalent of the name given in some countries, as in Germany, to certain administrative divisions.n. In astronomy and geodesy, a piece of metal or glass with lines engraved upon it so as to form graduations dividing the circumference of a circle into equal parts; hence, any instrument of which such a graduated circle forms the part that is most important or most difficult to make.n. A small shuttle made in the form of a horseshoe, and moving in a circular path.n. In geography, a small circle the plane of which is perpendicular to the axis of the earth; a circle of the globe parallel to the equator: more usually called a parallel of latitude.n. A line showing the hour on a sun-dial.n. A circle of declination: referred to as the two-hour circle, etc., especially as the six-hour circle.To encircle; encompass; surround; inclose.To move around; revolve around.To make to move in a circle or to revolve.To move in a round or circle; circulate; revolve or turn circularly.To form a circle; assume or have the form of a circle.n. A bookbinders' wheel-shaped tool, having a design engraved on the rim or edge.n. A circle of communicating arterioles on the sclerotic surrounding the optic nerve.n. A ring of fibrocartilage which gives support to the auriculoventricular valve on each side of the heart. Also called circulus callosus Halleri.n. The circumcircle of the triangle of similitude of three figures directly similar.n. Second Lemoine circle. Same as cosine circle.n. In gearing, the pitch-circle.n. In surgery, the passage of chyme, after gastro-enterostomy, through the artificial opening into the intestine, and then its regurgitation, in consequence of antiperistaltic action, through the pylorus back into the stomach.n. The mutually accelerating action of two independent but coexisting diseases.
