Meaning of octant

oc•tant

Pronunciation: (ok'tunt), [key]
— n.
  1. the eighth part of a circle.
  2. any of the eight parts into which three mutually perpendicular planes divide space.
  3. an instrument having an arc of 24°, used by navigators for measuring angles up to 90°.
  4. the position of one heavenly body when 45° distant from another.
  5. (cap.)the constellation Octans.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: