All 3 Uses

eccentric
in
The Absolutely True Diary of a Part-Time Indian
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Sure, my dad has a drinking problem and my mom can be a little eccentric, but they make sacrifices for me.
Chpt 22 *

eccentric = unconventional or strange
Now, in the old days, Indians used to be forgiving of any kind of eccentricity.†
Chpt 22

eccentricity = unconventional or strange behavior
Of course, ever since white people showed up and brought along their Christianity and their fears of eccentricity, Indians have gradually lost all of their tolerance.†
Chpt 22

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".