follow Dictionary.com

11 Trending Words of 2014

octant

[ok-tuh nt] /ˈɒk tənt/
noun
1.
the eighth part of a circle.
2.
Mathematics. any of the eight parts into which three mutually perpendicular planes divide space.
3.
an instrument having an arc of 24°, used by navigators for measuring angles up to 90°.
4.
the position of one heavenly body when 45° distant from another.
5.
(initial capital letter) Astronomy. the constellation Octans.
Origin
1680-1690
1680-90; < Latin octant- (stem of octāns); see Octans
Related forms
octantal
[ok-tan-tl] /ɒkˈtæn tl/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for octantal

octant

/ˈɒktənt/
noun
1.
(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
2.
(astronomy) the position of a celestial body when it is at an angular distance of 45° from another body
3.
an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45°
Word Origin
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
Cite This Source
Word Origin and History for octantal

octant

n.

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."

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for octant

Some English speakers likely know this word

Word Value for octantal

10
13
Scrabble Words With Friends

Nearby words for octantal