eccentric
Americanadjective
-
deviating from the recognized or customary character, practice, etc.; irregular; erratic; peculiar; odd.
eccentric conduct;
an eccentric person.
- Antonyms:
- conventional, customary, ordinary, regular, normal
-
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.
-
(of an axis, axle, etc.) not situated in the center.
-
Machinery. having the axis or support away from the center.
an eccentric wheel.
-
Astronomy. deviating from a circular form, as an elliptic orbit.
noun
-
a person who has an unusual, peculiar, or odd personality, set of beliefs, or behavior pattern.
-
something that is unusual, peculiar, or odd.
-
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 eccentricstrap, to which a rod eccentricrod is attached.
adjective
-
deviating or departing from convention, esp in a bizarre manner; irregular or odd
-
situated away from the centre or the axis
-
not having a common centre Compare concentric
eccentric circles
-
not precisely circular
noun
-
a person who deviates from normal forms of behaviour, esp in a bizarre manner
-
a device for converting rotary motion to reciprocating motion
Other Word Forms
Derived Forms
Etymology
Origin of eccentric
First recorded in 1350–1400; from Medieval Latin eccentricus, from Greek ékkentr(os) “out of center” ( see ec-, center) + Latin -icus -ic
Explanation
You're most likely to encounter the adjective eccentric in a description of an unusual or quirky person — like a scatterbrained aunt who leaves her life savings to her cat. From the Greek ekkentros, "out of the center," this word originally had to do with the orbits of planets that were observed to be slightly out of whack. Eventually it came to describe people who were a little kooky, both as an adjective and as a noun, too: an eccentric is an unconventional, odd person. Think of them as following a slightly different orbit from the rest of society.
Vocabulary lists containing eccentric
List 2
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The Westing Game
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Born a Crime
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The 32-year-old Tree -- with a distinctive bowl haircut and eccentric, meme-worthy internet persona -- was known for hits such as "Life Goes On," "Miss You," and "Alien Boy."
From Barron's • Jun. 14, 2026
Filled with eccentric decorative touches that mirrored Simmons’ vibrant public persona, the property features everything from staircase cherubs and boldly patterned wallpaper to curved French doors, terraced gardens, and a key-shaped swimming pool.
From MarketWatch • Jun. 3, 2026
He appeared last year as cold-blooded gangster Colorado in crime thriller Caught Stealing alongside Austin Butler, Regina King and Zoë Kravitz; and as Happy Gilmour's eccentric golf caddie Oscar in Adam Sandler's comedy sequel.
From BBC • May 27, 2026
Providing a nonstop stream of eccentric social commentary, improbable memories and terrible jokes, Harry is an amiable codger who has no filter whatsoever.
From The Wall Street Journal • May 21, 2026
I tried not to stare, but the newcomer was most eccentric.
From "Hattie Big Sky" by Kirby Larson
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
