Definition 1 of 2
Plain English Meaning
A way of finding where you are by drawing lines from two or more known places and seeing where those lines cross. Where they meet is your position.
Full Definition
A method of determining an unknown position by taking bearings to two or more known reference points and plotting the lines from those points until they intersect. The point where the bearing lines cross marks the unknown location.
Context Anchor
Used in pilotage, chart navigation, and radio navigation when a pilot fixes position from known ground features or navigation signals.
Derivation
From the Latin 'triangulum' meaning 'triangle.' The name comes from the fact that two bearing lines and the line between the two known reference points form a triangle, with the unknown position at one corner.