noun

• (uncountable, surveying) A technique in which distances and directions are estimated from an accurately measured baseline and the principles of trigonometry; (countable) an instance of the use of this technique.
• (countable, surveying) The network of triangles so obtained, that are the basis of a chart or map.
• (countable, chess) A delaying move in which the king moves in a triangular path to force the advance of a pawn.
• (countable, geometry) A subdivision of a planar object into triangles, and by extension the subdivision of a higher-dimension geometric object into simplices.
• (uncountable, navigation, seismology) A process by which an unknown location is found using three known distances from known locations.
• (uncountable, politics) The practice of repositioning one's group or oneself on the political spectrum in an attempt to capture the centre.
• (uncountable, qualitative research) 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.