eccentricity

noun

ec·​cen·​tric·​i·​ty ˌek-(ˌ)sen-ˈtri-sə-tē 

plural eccentricities

1

a

: the quality or state of being eccentric

b

: deviation from an established pattern or norm

especially : odd or whimsical behavior

2

a

: a mathematical constant that for a given conic section is the ratio of the distances from any point of the conic section to a focus and the corresponding directrix

b

: the eccentricity of an astronomical orbit used as a measure of its deviation from circularity

Synonyms

• crotchet
• curiosity
• erraticism
• idiosyncrasy
• individualism
• kink
• mannerism
• oddity
• peculiarity
• quiddity
• quip
• quirk
• singularity
• tic
• trick
• twist

Examples of eccentricity in a Sentence

Some people weren't very tolerant of his eccentricity.

Talking to her plants is one of her many eccentricities.

Recent Examples on the Web

As if life weren’t challenging enough already, Evie is going to be navigating this amongst the eccentricity of her family home, living with her fiercely loving single mum Suz (Suranne Jones), sister Izzie (Liv Hill), and handsome boyfriend (sometime man of the house) Josh (Adam Long). —Lily Ford, The Hollywood Reporter, 27 Dec. 2024

His eccentricities — once easily dismissed as the affectations of a lonely man — read maniacal. —Amanda Whiting, Vulture, 25 Oct. 2024

Some are experimenting, others are leaning hard into eccentricity. —Robyn Mowatt, Essence, 12 Sep. 2024

And, as the world grows heavier, delight can be found in the eccentricities and achievements of our fellow humans. —Carolyn Wells, Longreads, 13 Dec. 2024

Word History

Etymology

borrowed from Medieval Latin excentricitāt-, excentricitās, from ecentricus, excentricus "not having the earth exactly at its center, eccentric entry 1" + Latin -itāt-, -itās -ity

First Known Use

1545, in the meaning defined at sense 1a

Kids Definition

eccentricity

noun

ec·​cen·​tric·​i·​ty ˌek-ˌsen-ˈtris-ət-ē 

plural eccentricities

1

a

: the quality or state of being eccentric

b

: something that does not follow an established pattern, norm, or rule

especially : unusual behavior

2

: the amount by which a nearly circular path is not circular

an orbit's eccentricity