Meaning of trilateration

tri•lat•er•a•tion

Pronunciation: (trī-lat'u-rā'shun), [key]
— n. Survey.
  1. a method of determining the relative positions of three or more points by treating these points as vertices of a triangle or triangles of which the angles and sides can be measured.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.