noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   The eighth part of a circle; an arc of 45 degrees.
2. 2
   a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration wordnet
3. 3
   The aspect of two planets that are 45°, or one-eighth of a circle, apart.
4. 4
   The eighth part of a disc; a sector of 45 degrees; half a quadrant.
5. 5
   An instrument for measuring angles, particularly of elevation.

Synonyms

All synonyms

compassdirection findergaugeinstrumentoctileoctile

Etymology

From Latin octāns. Doublet of Octans.

Editorial Guides For "octant"

How to Write Clear Call-to-Action Copy

Create stronger CTA text for landing pages and product flows without hype language.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.