an oddity or peculiarity, as of conduct

an interesting man, known for his eccentricities.

the quality of being eccentric.

the amount by which something is eccentric.

Machinery . the distance between the centers of two cylindrical objects one of which surrounds the other, as between an eccentric and the shaft on which it is mounted.

Mathematics . a constant expressed as the ratio of the distance from a point on a conic to a focus and the distance from the point to the directrix.

noun

commonality , dullness , normality , regularness , standard , uniformity , usual , usualness

noun

aberration , abnormality , anomaly , caprice , capriciousness , foible , freakishness , hereticism , idiocrasy , idiosyncrasy , irregularity , kink , nonconformity , oddity , oddness , outlandishness , peculiarity , queerness , quirk , singularity , strangeness , unconventionality , unorthodoxness , waywardness , weirdness , whimsicality , whimsicalness , quirkiness , deviation