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Definition of eccentricity : 1. The distance of the center of figure of a body, as of an eccentric, from an axis about which it turns; the throw.
2. The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi- transverse axis.
3. The ratio of the distance of the center of the orbit of a heavenly body from the center of the body round which it revolves to the semi- transverse axis of the orbit.
4. The state of being eccentric; deviation from the customary line of conduct; oddity.

Synonyms:

kink, twist, trick, philosophy, mannerism, erraticism, concept, usual, principle, idea, thought, liberal, tic, faith, quiddity, study at idiosyncrasy, heretic, ideal, heathen, quip, extremism, crotchet, theory, freethinker, iconoclastic, quirk, infidel, individualism, bad apple, iconoclast, belief, commitment

farce, paradox, balderdash, idiocy, foolishness, meaninglessness, craziness, baloney, ludicrousness, absurdity, invalidity, implausibility, inanity, anachronism, silliness, preposterousness, irrationality, self-contradiction, impossibility, contradiction, bizarreness, nonsense, folly

incredibility, nonsensicality, grotesqueness, dubiousness, outrageousness, weirdness, ridiculousness

curiosity, impropriety, idiosyncrasy, incongruity, freakishness, quirkiness, divergence, inconsistency, incompatibility, oddity, strangeness, difference, unfamiliarity, peculiarity, aberrance, nonconformity, derangement, uniqueness, outlandishness, deviation, anomaly, aberration, singularity, uncommonness, irregularity, unconventionality, exception, abnormality, funniness

fluctuation, asymmetry, jerkiness, inconstancy, intermittence, unevenness, capriciousness, fitfulness, variability

Usage examples:

• Those who loved him must tolerate this eccentricity, whether they liked it or not. - "The Song of Songs", Hermann Sudermann.
• " An Englishman did me the favour- from pure eccentricity, of course- to save my life on that exact spot, General," said the count. - "Vittoria, v8", George Meredith.
• It was simply a matter of stretching the orbit to extreme eccentricity as all the ships went round the planet. - "The Pirates of Ersatz", Murray Leinster.