Plural of eccentricity; unusual or unconventional characteristics, behaviors, or qualities; also, the state of being off-center in circles or orbits.
From 'eccentricity' (from 'eccentric') + plural -ies. Can refer both to oddities in behavior and to mathematical/astronomical measurements of how far orbits deviate from perfect circles.
Eccentricity appears in astronomy (how elliptical an orbit is) and psychology (personality quirks)—it's one of those rare words where the same term means something precise in math and something poetic in personality!
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