Not located or situated in the center; away from the center or axis: as, in botany, lateral embryos and the stipes of some hymenomycetous fungi are said to be eccentric.In medicine, not originating or existing in the center or central parts; due to peripheral causes: as, eccentric irritation; eccentric convulsions (that is, convulsions due to peripheral irritation).Not coincident as regards center; specifically, in geometry, not having the same center: applied to circles and spheres which have not the same center, and consequently are not parallel: opposed to concentric, having a common center.Not coincident as regards course or aim; tending to a different end or result; devious.Deviating, or characterized by deviation, from recognized, stated, or usual methods or practice, or from established forms, laws, etc.; irregular; erratic; odd: as, eccentric conduct; an eccentric person.Of or pertaining to an eccentric: as, the eccentric anomaly of a planet; the eccentric rod of a steam-engine.In senses 3 and 6 sometimes written excentric.n. In ancient astronomy, a circle having its center remote from the earth and carrying an epicycle which in its turn was supposed to carry a planet.n. In mod. astron., a circle described about the center of an elliptical orbit, with half the major axis for radius.n. In mech., a device for converting a regular circular motion into an irregular reciprocating rectilinear motion.n. One who or that which is irregular or anomalous in action; a person of eccentric habits.In astronomy, noting orbital motion which is not in a circle around the center of attraction; as applied to curves generally, deviating from circularity, as the ellipse and hyperbola.