from
The Collaborative International Dictionary of English v.0.48
Circle \Cir"cle\ (s[~e]r"k'l), n. [OE. cercle, F. cercle, fr. L.
circulus (Whence also AS. circul), dim. of circus circle,
akin to Gr. kri`kos, ki`rkos, circle, ring. Cf. {Circus},
{Circum-}.]
[1913 Webster]
1. A plane figure, bounded by a single curve line called its
circumference, every part of which is equally distant from
a point within it, called the center.
[1913 Webster]
2. The line that bounds such a figure; a circumference; a
ring.
[1913 Webster]
3. (Astron.) An instrument of observation, the graduated limb
of which consists of an entire circle.
[1913 Webster]
Note: When it is fixed to a wall in an observatory, it is
called a {mural circle}; when mounted with a telescope
on an axis and in Y's, in the plane of the meridian, a
{meridian circle} or {transit circle}; when involving
the principle of reflection, like the sextant, a
{reflecting circle}; and when that of repeating an
angle several times continuously along the graduated
limb, a {repeating circle}.
[1913 Webster]
4. A round body; a sphere; an orb.
[1913 Webster]
It is he that sitteth upon the circle of the earth.
--Is. xi. 22.
[1913 Webster]
5. Compass; circuit; inclosure.
[1913 Webster]
In the circle of this forest. --Shak.
[1913 Webster]
6. A company assembled, or conceived to assemble, about a
central point of interest, or bound by a common tie; a
class or division of society; a coterie; a set.
[1913 Webster]
As his name gradually became known, the circle of
his acquaintance widened. --Macaulay.
[1913 Webster]
7. A circular group of persons; a ring.
[1913 Webster]
8. A series ending where it begins, and repeating itself.
[1913 Webster]
Thus in a circle runs the peasant's pain. --Dryden.
[1913 Webster]
9. (Logic) A form of argument in which two or more unproved
statements are used to prove each other; inconclusive
reasoning.
[1913 Webster]
That heavy bodies descend by gravity; and, again,
that gravity is a quality whereby a heavy body
descends, is an impertinent circle and teaches
nothing. --Glanvill.
[1913 Webster]
10. Indirect form of words; circumlocution. [R.]
[1913 Webster]
Has he given the lie,
In circle, or oblique, or semicircle. --J.
Fletcher.
[1913 Webster]
11. A territorial division or district.
[1913 Webster]
Note:
{The Circles of the Holy Roman Empire}, ten in number, were
those principalities or provinces which had seats in the
German Diet.
[1913 Webster]
{Azimuth circle}. See under {Azimuth}.
{Circle of altitude} (Astron.), a circle parallel to the
horizon, having its pole in the zenith; an almucantar.
{Circle of curvature}. See {Osculating circle of a curve}
(Below).
{Circle of declination}. See under {Declination}.
{Circle of latitude}.
(a) (Astron.) A great circle perpendicular to the plane
of the ecliptic, passing through its poles.
(b) (Spherical Projection) A small circle of the sphere
whose plane is perpendicular to the axis.
{Circles of longitude}, lesser circles parallel to the
ecliptic, diminishing as they recede from it.
{Circle of perpetual apparition}, at any given place, the
boundary of that space around the elevated pole, within
which the stars never set. Its distance from the pole is
equal to the latitude of the place.
{Circle of perpetual occultation}, at any given place, the
boundary of the space around the depressed pole, within
which the stars never rise.
{Circle of the sphere}, a circle upon the surface of the
sphere, called a great circle when its plane passes
through the center of the sphere; in all other cases, a
small circle.
{Diurnal circle}. See under {Diurnal}.
{Dress circle}, a gallery in a theater, generally the one
containing the prominent and more expensive seats.
{Druidical circles} (Eng. Antiq.), a popular name for certain
ancient inclosures formed by rude stones circularly
arranged, as at Stonehenge, near Salisbury.
{Family circle}, a gallery in a theater, usually one
containing inexpensive seats.
{Horary circles} (Dialing), the lines on dials which show the
hours.
{Osculating circle of a curve} (Geom.), the circle which
touches the curve at some point in the curve, and close to
the point more nearly coincides with the curve than any
other circle. This circle is used as a measure of the
curvature of the curve at the point, and hence is called
circle of curvature.
{Pitch circle}. See under {Pitch}.
{Vertical circle}, an azimuth circle.
{Voltaic circuit} or {Voltaic circle}. See under {Circuit}.
{To square the circle}. See under {Square}.
Syn: Ring; circlet; compass; circuit; inclosure.
[1913 Webster]