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octant

[ ok-tuhnt ]
/ ˈɒk tənt /
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noun
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.
Octant, Astronomy. the constellation Octans.
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Origin of octant

First recorded in 1680–90; from Latin octant- (stem of octāns ); see Octans

OTHER WORDS FROM octant

oc·tan·tal [ok-tan-tl], /ɒkˈtæn tl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use octant in a sentence

British Dictionary definitions for octant

octant
/ (ˈɒktənt) /

noun
maths
  1. any of the eight parts into which the three planes containing the Cartesian coordinate axes divide space
  2. an eighth part of a circle
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°

Word Origin for octant

C17: from Latin octans half quadrant, from octo eight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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