octant Octans • octantal · · · Info · Definitions · Characters · · octant · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074