Definitions from Wiktionary (backsight)

▸ noun:  The rear sight of a firearm.
▸ noun:  (surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).
▸ noun:  (surveying) A measurement of a previously shot point, used to set the angle to zero when occupying a new position.
▸ verb:  (surveying) To shoot a backsight.



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