triangulation
noun /traɪˌæŋɡjuˈleɪʃn/
/traɪˌæŋɡjuˈleɪʃn/
[uncountable] (specialist)- a method of finding out distance and position, usually on a map, by measuring the distance between two fixed points and then measuring the angle from each of these to the third point
（通常在地图上做的）三角测量，三角定位