nt]
| 1. | the eighth part of a circle. |
| 2. | Mathematics. 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. | (initial capital letter ) Astronomy. the constellation Octans. |