eccentric

[ik-sen-trik, ek-]
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adjective
  1. deviating from the recognized or customary character, practice, etc.; irregular; erratic; peculiar; odd: eccentric conduct; an eccentric person.
  2. Geometry. not having the same center; not concentric: used especially of two circles or spheres at least one of which contains the centers of both.
  3. (of an axis, axle, etc.) not situated in the center.
  4. Machinery. having the axis or support away from the center: an eccentric wheel.
  5. Astronomy. deviating from a circular form, as an elliptic orbit.
noun
  1. a person who has an unusual, peculiar, or odd personality, set of beliefs, or behavior pattern.
  2. something that is unusual, peculiar, or odd.
  3. Machinery. a device for converting circular motion into rectilinear motion, consisting of a disk fixed somewhat off-center to a revolving shaft, and working freely in a surrounding collar (eccentric strap), to which a rod (eccentric rod) is attached.
Also especially British, ex·cen·tric.

Origin of eccentric

1350–1400; < Medieval Latin eccentricus < Greek ékkentr(os) out of center (see ec-, center) + Latin -icus -ic
Related formsec·cen·tri·cal, adjectiveec·cen·tri·cal·ly, adverbnon·ec·cen·tric, adjectivenon·ec·cen·tri·cal·ly, adverbun·ec·cen·tric, adjectiveun·ec·cen·tri·cal·ly, adverb

Synonyms for eccentric

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Antonyms for eccentric

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for eccentric

eccentric

adjective
  1. deviating or departing from convention, esp in a bizarre manner; irregular or odd
  2. situated away from the centre or the axis
  3. not having a common centreeccentric circles Compare concentric
  4. not precisely circular
noun
  1. a person who deviates from normal forms of behaviour, esp in a bizarre manner
  2. a device for converting rotary motion to reciprocating motion
Derived Formseccentrically, adverb

Word Origin for eccentric

C16: from Medieval Latin eccentricus, from Greek ekkentros out of centre, from ek- ex- 1 + kentron centre
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eccentric
n.

early 15c., "eccentric circle or orbit," originally a term in Ptolemaic astronomy, "circle or orbit not having the Earth precisely at its center," from Middle French eccentrique and directly from Medieval Latin eccentricus (noun and adjective), from Greek ekkentros "out of the center" (as opposed to concentric), from ek "out" (see ex-) + kentron "center" (see center (n.)). Meaning "odd or whimsical person" attested by 1824.

June 4 [1800].--Died in the streets in Newcastle, William Barron, an eccentric, well known for many years by the name of Billy Pea-pudding. [John Sykes, "Local Records, or Historical Register of Remarkable Events which have Occurred Exclusively in the Counties of Durham and Northumberland, Town and County of Newcastle Upon Tyne, and Berwick Upon Tweed," Newcastle, 1824]
adj.

1550s, from Middle French eccentrique and directly from Medieval Latin eccentricus (noun and adjective; see eccentric (n.)). Figurative sense of "odd, whimsical" first recorded 1620s.

Online Etymology Dictionary, © 2010 Douglas Harper

eccentric in Medicine

eccentric

[ĭk-sĕntrĭk, ĕk-]
adj.
  1. Departing from a recognized, conventional, or established norm or pattern.
  2. Situated or proceeding away from the center.
n.
  1. A person of odd or unconventional behavior.
Related formsec′cen•trici•ty (ĕk′sĕn-trĭsĭ-tē) n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.