An Etymological Dictionary of Astronomy and Astrophysics

In surveying and navigation, the process of deriving the linear distance between any two remote points by the division of a large area into adjacent triangles and
using trigonometric relationships. See also → trilateration.

Etymology (EN): From M.L. triangulation-, from triangulare “to make triangles,” → triangle.

Etymology (PE): Seguš-bandi, from sé, → three, + guš/gušé, → angle, + bandi verbal noun from bastan “to form, bind, tie” (Mid.Pers. bastan/vastan “to bind, shut;” Av./O.Pers. band- “to bind, fetter,” banda- “band, tie;” cf. Skt. bandh- “to bind, tie, fasten;” Ger. binden; E. bind; PIE base *bhendh- “to bind”).