backsight noun 3verb 1forms 3 noun3 •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). •A measurement of a previously shot point, used to set the angle to zero when occupying a new position. •The rear sight of a firearm. verb1 •To shoot a backsight. formsbacksighted · backsighting · backsights
