Full Circle Meaning

(geometry) An arc of 360 degrees.

Example: Used other than as an idiom: see full,‎ circle.
2007, Carolyn C. Wheater, Geometry, page 193
  Arcs are measured in degrees, with 360° in the full circle.
A full turn back to the original direction or orientation.
2006, Jack Dawson, Reflections in a Curved Glass, page 31
  He cackled confidentially, like he knew more than he was telling, then threw his head back and crowed once and strutted in a full circle like a rumpled old rooster.
By extension, of a discussion, a point arrived at which is the same point at which it began; the point at which effort has resulted in no progress.