Meaning of backsight | Babel Free

Definitions

1. The rear sight of a firearm.
2. 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).
3. A measurement of a previously shot point, used to set the angle to zero when occupying a new position.

Examples

“Holonym: iron sights”

CEFR level