You're most likely to encounter the adjective eccentric in a description of an unusual or quirky person like a scatterbrained aunt who leaves her life savings to her cat.
Deviating or departing from the center, or from the line of a circle;
Noun
a person of a specified kind (usually with many eccentricities); "a real character"; "a strange character"; "a friendly eccentric"; "the capable type"; "a mental case"
Noun
a person with an unusual or odd personality
Adjective
not having a common center; not concentric; "eccentric circles"
Adjective S.
conspicuously or grossly unconventional or unusual; "restaurants of bizarre design--one like a hat, another like a rabbit"; "famed for his eccentric spelling"; "a freakish combination of styles"; "his off-the-wall antics"; "the outlandish clothes of teena
a.
Deviating or departing from the center, or from the line
of a circle; as, an eccentric or elliptical orbit; pertaining to
deviation from the center or from true circular motion.
a.
Not having the same center; -- said of circles,
ellipses, spheres, etc., which, though coinciding, either in whole or
in part, as to area or volume, have not the same center; -- opposed to
concentric.
a.
Pertaining to an eccentric; as, the eccentric rod in a
steam engine.
a.
Not coincident as to motive or end.
a.
Deviating from stated methods, usual practice, or
established forms or laws; deviating from an appointed sphere or way;
departing from the usual course; irregular; anomalous; odd; as,
eccentric conduct.
n.
A circle not having the same center as another contained
in some measure within the first.
n.
One who, or that which, deviates from regularity; an
anomalous or irregular person or thing.
n.
In the Ptolemaic system, the supposed circular orbit of
a planet about the earth, but with the earth not in its center.
n.
A circle described about the center of an elliptical
orbit, with half the major axis for radius.
n.
A disk or wheel so arranged upon a shaft that the center
of the wheel and that of the shaft do not coincide. It is used for
operating valves in steam engines, and for other purposes. The motion
derived is precisely that of a crank having the same throw.
Eccentric
His own ends, which must needs be often eccentric to those of his master.5.
He shines eccentric, like a comet's blaze.
Eccentric
Deviating or departing from the center, or from the line of a circle;
A circle not having the same center as another contained in some measure within the first.
Usage Examples
I was doing these performance art pop music pieces in the city. And they were a bit on the eccentric side I suppose. So people started to call me Gaga after the Queen song 'Radio Gaga.'
The amount of eccentricity in a society has generally been proportional to the amount of genius, mental vigor, and moral courage it contained. That so few now dare to be eccentric marks the chief danger of the time.
I was born into the most remarkable and eccentric family I could possibly have hoped for.
I know it's a cliche, but the whole family is just whacked. I mean, we're all out of our minds. They're the funniest, most eccentric bizarre people I've ever met, my siblings.
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Other Usage ExamplesDo not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.
You pretend to be more eccentric than you actually are because you fear you are an interchangeable cog.
To seek understanding before taking action, yet to trust my instincts when action is called for. Never to avoid danger from fear, never to seek out danger for its own sake. Never to conform to fashion from fear of eccentricity, never to be eccentric from fear of conformity.
Money, like vodka, turns a person into an eccentric.