<p><strong>Noun</strong></p><ul><li>The eighth part of a circle.</li><li>In Mathematics, any of the eight parts into which three mutually perpendicular planes divide space.</li><li>An instrument having an arc of 24°, used by navigators for measuring angles up to 90°.</li><li>The position of one heavenly body when 45° distant from another.</li><li>In Astronomy, the constellation Octans.</li></ul>