Meanings
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1
noun
A navigational device for deriving angular distances between objects so as to determine latitude and longitude.
[…] I can do more with a Quadrant, Sextant or Octant, of 1 foot Radius, furniſhed with Teleſcopical Sights and Screws, then ^([sic]) can poſſibly be done with any other Inſtrument, furniſhed only with Common Sights, though 10, 20, 30, nay threeſcore foot Radius; […].
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Thesaurus
From Latin sextāns.