Eccentricity can describe the displacement of an applied force to an object from a line of action. The vectors pertaining to the orbit of a planet. Or non-normative behavior in a person.

Eccentricity refers to unusual behavior, or actions that are considered abnormal. If someone wore a pink shirt every day and wore no other color, they would be considered eccentric.

The word eccentricity means strange or unconventional behavior, or possibly "off center" as regards mechanical issues. Here's a sentence or two: The old man's eccentricity led some people to believe he was crazy, but those living around him knew he was a kind and caring resident of the neighborhood. The bad bearing in the lathe left some eccentricity on all the parts turned on it, and these parts had to be rejected.

The eccentricity of the Earth is approximately 0.0167.

Eccentricity is only present in ovals and ellipses. A circle is present. The eccentricity of an oval or ellipse is how linear it is.