eccentricity
UK: ˌek.senˈtrɪs.ə.ti | US: ˌek.senˈtrɪs.ə.t̬i
n. the quality of being unconventional or slightly strange
n. (Mathematics) deviation from a circular path or orbit
n. (Physics) measure of how much an orbit deviates from circularity
The word "eccentricity" originates from the Greek ekkentros (ἔκκεντρος), combining ek- (out of) and kentron (center). The Latin eccentricus later adopted this meaning, referring to something "away from the center." By the 17th century, English used "eccentric" to describe planetary orbits deviating from circularity, eventually extending metaphorically to human behavior. The suffix -ity formalizes the abstract noun form.
Her eccentricity made her the most memorable person at the party.
The comet’s high eccentricity causes it to travel far from the sun.
His eccentricity includes collecting vintage typewriters.
In geometry, eccentricity measures how much a conic section deviates from being circular.
The artist’s eccentricity was reflected in his unconventional painting style.