different between circle vs epicycle

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rabbits existed; he thought they were all stuffed with sawdust like himself, and he understood that sawdust was quite out-of-date and should never be mentioned in modern circles.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

From Latin epicyclus, from Ancient Greek ????????? (epíkuklos), from ??? (epí, “upon”) + ?????? (kúklos, “circle”).

Pronunciation

• (UK) IPA^(key): /??p??sa?k?l/

Noun

epicycle (plural epicycles)

1. (astronomy) A small circle whose centre is on the circumference of a larger circle; in Ptolemaic astronomy it was seen as the basis of revolution of the "seven planets", given a fixed central Earth.
   • , Folio Society, 2006, vol.1, p.155:

     Is it not [Philosophie], that […] teacheth miserie, famine and sicknesse to laugh? Not by reason of some imaginarie Epicicles, but by naturall and palpable reasons.

2. (mathematics) Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
3. (organic chemistry) A ring of atoms joining parts of an already cyclic compound
4. (figuratively) An ad hoc complication added to a model to make it fit the known data
   • 1978, The Journal of the Siam Society, volumes 66-67, page 152:

     If two chronicles seemed contradictory, instead of trying to choose between them, a rationalization (epicycle) was devised to cover both.

   • 1998, Paul Joseph Kelly, Impartiality, Neutrality and Justice: Re-reading Brian Barry’s Justice as Impartiality, page 12:

     Rather than solve the theoretical problem of how to produce a method of political ethics, the contractarian device introduces an unnecessary theoretical epicycle into what is otherwise a coherent account of social justice in particular and political morality in general.

Derived terms

• epicyclic

Translations