n. A technique in surveying in which distances and directions are estimated from an accurately measured baseline and the principles of trigonometryn. The network of triangles, so obtained, that are the basis of a map or chartn. In navigation or seismology, a process by which an unknown location is found using three known distances from known locations.n. A delaying move in which the king moves in a triangular path in order to force the advance of a pawn.n. The use of three (or more) researchers to interview the same people or to evaluate the same evidence to reduce the impact of individual bias.