The quality of being eccentric or departing from the usual center or standard; deviation from what is normal or expected.
From Latin 'ex' (out) + 'centrum' (center) + '-icity' (quality of). The word evolved from geometric usage describing orbits not centered on a fixed point, later metaphorically applied to unusual behavior or character.
Medieval astronomers noticed planets didn't orbit in perfect circles around Earth—they tracked this 'excentricity' mathematically, which later became our word for quirky people who don't follow society's 'center.'
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