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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 of a vertex in a graph at distance (graph theory)
• Eccentric contraction, lengthening of muscle fibers
• Eccentric (mechanism), a wheel that rotates on an axle that is displaced from the focus of the circle described by the wheel
• Eccentric position of a surveying tripod to be able to measure hidden points
• Orbital eccentricity, in astrodynamics, calculated from orbital state vectors as an absolute value of eccentricity vector or using other methods based on orbital energy and angular momentum.
• A type of deferent, a circle or sphere used in obsolete astronomical systems to carry a planet around the Earth or Sun.

• Disambiguation pages