Eccentricity (orbit) , 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.
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
Eccentric (sport) , exercise movements involving the lengthening of muscle fibers
Eccentricity (behavior) , unusual or odd behaviour on the part of a person, as opposed to being "normal"
