ec•cen•tricɪkˈsɛn trɪk, ɛk-(adj.)

1. deviating from the accepted or customary character, practice, etc.; unconventional; peculiar; odd.

2. not having the same center; not concentric: used esp. of two circles or spheres at least one of which contains the centers of both.

   Category: Math

3. (of an axis, axle, etc.) not situated in the center.

4. having the axis or support away from the center:

   an eccentric wheel.

   Category: Machinery

5. Astron. deviating from a circular form, as an elliptic orbit.

   Category: Astronomy

6. (n.)an eccentric person.

7. something that is unusual, peculiar, or odd.

8. a device for converting rotary motion to reciprocating motion, consisting of a disk with an off-center axis of revolution.

   Category: Machinery

Origin of eccentric:

1350–1400; < ML eccentricus < Gk ékkentr(os) having an eccentric orbit

ec•cen′tri•cal•ly(adv.)