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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.
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Octant
is always a great word to know.
So is proportion. Does it mean:
| a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios |
| a number that is a submultiple of all the numbers of a given set |
Collins
World English Dictionary
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History
octant
"instrument for making angular measurements in navigation or astronomy," 1731, from L.L. octans, from octo "eight" (see octa-).
Online Etymology Dictionary, © 2010 Douglas Harper
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