different between circle vs boundary

English

Etymology

From Middle English circle, cercle, from Old French cercle and Latin circulus, diminutive of Latin circus (“circle, circus”), from Ancient Greek ?????? (kírkos, “circle, ring”), related to Old English hring (“ring”). Compare also Old English ?ircul (“circle, zodiac”), which came from the same Latin source.

Pronunciation

• enPR: sûr?-k?l, IPA^(key): /?s??k?l/
  • (UK) IPA^(key): [?s??.k??]
  • (US) IPA^(key): [?s?.k??]
• Rhymes: -??(?)k?l
• Homophone: cercal
• Hyphenation: cir?cle

Noun

circle (plural circles)

1. (geometry) A two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from a given point (center).

   Synonyms: (not in mathematical use) coil, (not in mathematical use) ring, (not in mathematical use) loop

2. A two-dimensional geometric figure, a disk, consisting of the set of all those points of a plane at a distance less than or equal to a fixed distance (radius) from a given point.

   Synonyms: disc, (in mathematical and general use) disk, (not in mathematical use; UK & Commonwealth only) round

3. Any shape, curve or arrangement of objects that approximates to or resembles the geometric figures.

   Children, please join hands and form a circle.

   1. Any thin three-dimensional equivalent of the geometric figures.

   2. A curve that more or less forms part or all of a circle.

4. A specific group of persons; especially one who shares a common interest.

   Synonyms: bunch, gang, group

   • At half-past nine on this Saturday evening, the parlour of the Salutation Inn, High Holborn, contained most of its customary visitors. […] In former days every tavern of repute kept such a room for its own select circle, a club, or society, of habitués, who met every evening, for a pipe and a cheerful glass.

   • “I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the insolent chatterers at the opera, the gorged dowagers, […], the jewelled animals whose moral code is the code of the barnyard—!"

   • 1922, Margery Williams, The Velveteen Rabbit

     The Rabbit could not claim to be a model of anything, for he didn’t know that real rabbits existed; he thought they were all stuffed with sawdust like himself, and he understood that sawdust was quite out-of-date and should never be mentioned in modern circles.

5. The orbit of an astronomical body.
6. (cricket) A line comprising two semicircles of 30 yards radius centred on the wickets joined by straight lines parallel to the pitch used to enforce field restrictions in a one-day match.
7. (Wicca) A ritual circle that is cast three times deosil and closes three times widdershins either in the air with a wand or literally with stones or other items used for worship.
8. (South Africa) A traffic circle or roundabout.
9. (obsolete) Compass; circuit; enclosure.
10. (astronomy) An instrument of observation, whose graduated limb consists of an entire circle. When 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 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.
11. A series ending where it begins, and repeating itself.

    • Thus in a circle runs the peasant's pain.

12. (logic) A form of argument in which two or more unproved statements are used to prove each other; inconclusive reasoning.
    • 1661, Joseph Glanvill, The Vanity of Dogmatizing

      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.

13. Indirect form of words; circumlocution.
    • 1610, Ben Jonson, The Alchemist

      Has he given the lie, / In circle, or oblique, or semicircle.

14. A territorial division or district.

15. (in the plural) A bagginess of the skin below the eyes from lack of sleep.

Derived terms

Related terms

• circular
• circulate
• circus

Descendants

• Pitcairn-Norfolk: sirkil

Translations

Verb

circle (third-person singular simple present circles, present participle circling, simple past and past participle circled)

1. (transitive) To travel around along a curved path.

   The wolves circled the herd of deer.
2. (transitive) To surround.

   A high fence circles the enclosure.

   • 1699, William Dampier, Voyages and Descriptions

     Their heads are circled with a short turban.

   • 1798, Samuel Taylor Coleridge, The Dungeon

     So he lies, circled with evil.

3. (transitive) To place or mark a circle around.

   Circle the jobs that you are interested in applying for.

4. (intransitive) To travel in circles.

   Vultures circled overhead.

Derived terms

• circle the drain

Translations

Anagrams

• cleric

English

Etymology

bound +? -ary, Old French, from Latin.

Pronunciation

• (UK) IPA^(key): /?ba?nd?i/
• (US) IPA^(key): /?ba?nd??i/
• Rhymes: -a?nd?i

Noun

boundary (plural boundaries)

1. The dividing line or location between two areas.

   • So this was my future home, I thought! […] Backed by towering hills, the but faintly discernible purple line of the French boundary off to the southwest, a sky of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams.

2. (figuratively, often in the plural) The bounds, confines, or limits between immaterial things (such as one’s comfort zone, privacy, or professional sphere and the realm beyond).

3. (cricket) An edge or line marking an edge of the playing field.
4. (cricket) An event whereby the ball is struck and either touches or passes over a boundary (with or without bouncing), usually resulting in an award of 4 (four) or 6 (six) runs respectively for the batting team.
5. (topology) (of a set) The set of points in the closure of a set ${\displaystyle S}$, not belonging to the interior of that set.

Derived terms

• Boundary County
• boundary rider
• boundary umpire

Related terms

• bound

Translations

See also

• border
• confine
• frontier
• fladry

Further reading

• boundary in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• boundary in The Century Dictionary, New York, N.Y.: The Century Co., 1911.