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Meaning of apocenter

ap•o•cen•ter

Pronunciation: (ap'u-sen"tur), [key]
— n. Astron.
  1. the point in the orbit of a heavenly body farthest from a primary other than the earth or the sun. Cf. pericenter.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.