Eccentricity or eccentric may refer to:
- Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal"
 
Mathematics, science and technology
Mathematics
- Off-center, in geometry
 - Eccentricity (graph theory) of a vertex in a graph
 - Eccentricity (mathematics), a parameter associated with every conic section
 
Orbital mechanics
- Orbital eccentricity, in astrodynamics, a measure of the non-circularity of an orbit
 - Eccentric anomaly, the angle between the direction of periapsis and the current position of an object on its orbit
 - Eccentricity vector, in celestial mechanics, a dimensionless vector with direction pointing from apoapsis to periapsis
 - Eccentric, a type of deferent, a circle or sphere used in obsolete epicyclical systems to carry a planet around the Earth or Sun
 
Other uses in science and technology
- Eccentric (mechanism), a wheel that rotates on an axle that is displaced from the focus of the circle described by the wheel
 - Horizontal eccentricity, in vision, degrees of visual angle from the center of the eye
 - Eccentric contraction, the lengthening of muscle fibers
 - Eccentric position of a surveying tripod, to be able to measure hidden points
 - Eccentric training, the motion of an active muscle while it is lengthening under load
 - Eccentricity, a deviation from concentricity
 
Other uses
- Eccentric Club, a London gentlemen's club
 - The Eccentric
 - The Eccentrics
 
See also
- All pages with titles beginning with eccentric
 - All pages with titles containing eccentric*
 - Acentric (disambiguation)
 
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