Eccentricity may refer to: Eccentricity (behavior), unusual or odd behavior on the part of a person, as opposed to being "normal" Eccentricity (mathematics), a parameter associated with every conic section Eccentricity vector Eccentricity (graph theory) of a vertex in a graph Eccentric contraction, lengthening of muscle fibers Eccentric (mechanism), a wheel that rotates on an axle that's displaced from the focus of the circle described by the wheel Eccentric position of a surveying tripod… (More on Eccentricity)