Definitions of 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.

(Definitions from Wiktionary)

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