All 5 Uses

eccentric
in
A Sketch of the Past
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It arose—to name some elements at random—from his simplicity, his integrity, his eccentricity—by which I mean he would say exactly what he thought, however inconvenient; and do what he liked.†
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eccentricity = unconventional or strange behavior
But Mrs Dilke, save for that eccentricity, was the pink of fashion; a very pretty woman, and so well dressed, that we used to notice her new dress, and to say "Mrs Dilke has far more new clothes than you have" to mother, who never had new clothes, and dressed always, I think, in a very simple sewing woman made black dress.†
The home dress therefore might be, as on one night that comes back to mind, made cheaply but eccentrically, of a green fabric, bought at Story's, the furniture shop.†
But if it was a failure, then doom was before us; we would fall into the depths of dowdiness; of eccentricity.†

eccentricity = unconventional or strange behavior
Greatness still seems to me a positive possession; booming; eccentric; set apart; something to which I am led up dutifully by my parents.†

Definitions:

(1) (eccentric)
unconventional or strange; or a person with such traits -- often in a way that seems interesting or harmless
(2) (meaning too rare to warrant focus)
Much more rarely, in technical usage, eccentric can mean "not concentric".