Meaning of Callippic cycle

Cal•lip'pic cy'cle

Pronunciation: (ku-lip'ik), [key]
— Astron. Astron.
  1. a period equal to four Metonic cycles less one day, proposed by Callippus to correct the Metonic cycle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.