• Czech: výstřednost
• Greek: εκκεντρικός
• Swedish: excentricitet

• Greek: εκκεντρικότητα
• Swedish: excentricitet

Eccentricity may refer to:

• Eccentricity (behavior), unusual or odd behavior on the part of a person, as opposed to being "normal"
• Eccentricity (mathematics), a parameter associated with every conic section
• Eccentricity vector
• Eccentricity (graph theory) of a vertex in a graph
• Eccentric contraction, lengthening of muscle fibers
• Eccentric (mechanism), a wheel that rotates on an axle that is displaced from the focus of the circle described by the wheel
• Eccentric position of a surveying tripod to be able to measure hidden points
• Orbital eccentricity, in astrodynamics, calculated from orbital state vectors as an absolute value of eccentricity vector or using other methods based on orbital energy and angular momentum.
• Eccentric anomaly, the angle between the direction of periapsis and the current position of an object on its orbit.
• Eccentric (astronomy), a type of deferent, a circle or sphere used in obsolete astronomical systems to carry a planet around the Earth or Sun.

aberrance, aberrancy, aberration, abnormality, abnormity, absurdity, absurdness, amorphism, animus, anomalism, anomalousness, anomaly, aptitude, arrhythmia, asininity, battiness, bent, bias, bizarreness, bizarrerie, brainlessness, brokenness, buffoonery, capriciousness, cast, character, choppiness, clownishness, constitution, crackpottedness, crankiness, craziness, daffiness, derangement, desipience, desultoriness, deviability, deviation, diathesis, difference, disconnectedness, discontinuity, disposition, divergence, drollery, drollness, erraticism, erraticness, fatuity, fatuousness, fibrillation, fickleness, fitfulness, fits and starts, flightiness, fluctuation, folly, foolery, foolheadedness, foolishness, freakishness, frivolity, frivolousness, funniness, giddiness, goofiness, grain, heteromorphism, hilarity, humorousness, idiocy, idiosyncrasy, imbecility, impulsiveness, inanity, inclination, incongruity, inconsistency, inconstancy, individualism, ineptitude, inferiority, insanity, instability, intermittence, irregularity, jerkiness, kidney, laughability, leaning, ludicrousness, lunacy, madness, make, makeup, mental set, mercuriality, mettle, mind, mind-set, mindlessness, mold, monstrosity, moodiness, nature, niaiserie, nonuniformity, nugacity, nuttiness, patchiness, predilection, predisposition, preference, pricelessness, proclivity, propensity, quaintness, queerness, quizzicalness, restlessness, richness, ridiculousness, roughness, sappiness, screwiness, senselessness, set, shiftiness, silliness, slant, spasticity, sporadicity, sporadicness, spottiness, stagger, stamp, strain, streak, stripe, stupidity, subnormality, superiority, temper, temperament, tendency, teratism, the funny side, thoughtlessness, triflingness, triviality, turn, turn of mind, twist, type, uncertainty, undependability, unevenness, unfixedness, unmethodicalness, unnaturalism, unnaturalness, unpredictability, unreliability, unsettledness, unstableness, unsteadfastness, unsteadiness, unsystematicness, variability, variation, variety, wackiness, wantonness, warp, waywardness, weirdness, whimsicality, whimsicalness, witlessness, wittiness, wobble, zaniness, zanyism