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[ok-tuh nt] /ˈɒk tənt/

the eighth part of a circle.
Mathematics. any of the eight parts into which three mutually perpendicular planes divide space.
an instrument having an arc of 24°, used by navigators for measuring angles up to 90°.
the position of one heavenly body when 45° distant from another.
(initial capital letter) Astronomy. the constellation Octans.

(astronomy) the position of a celestial body when it is at an angular distance of 45° from another body
an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45°

instrument for making angular measurements in navigation or astronomy, 1731, from Late Latin octans “the eighth part,” from octo “eight” (see octa-) on analogy of quadrant. In geometry, octant meant “the eighth part of a circle.”


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  • Octarchy

    [ok-tahr-kee] /ˈɒk tɑr ki/ noun, plural octarchies. 1. a government by eight persons. 2. a group of eight states or kingdoms. /ˈɒktɑːkɪ/ noun (pl) -chies 1. government by eight rulers 2. a confederacy of eight kingdoms, tribes, etc noun a governmental body run by eight people; also, an alliance of eight states or governments

  • Octaroon

    /ˌɒktəˈruːn/ noun 1. a variant spelling of octoroon

  • Octastyle

    [ok-tuh-stahyl] /ˈɒk təˌstaɪl/ adjective, Architecture. 1. having eight columns in the front, as a temple or portico.

  • Octateuch

    [ok-tuh-took, -tyook] /ˈɒk təˌtuk, -ˌtyuk/ noun 1. the first eight books of the Old Testament, consisting of Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Joshua, Judges, and Ruth, or a volume containing them.

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