Etymology

triangulation

tri·an·gu·lat·ion
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Today it means: 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. Full definition →

Medieval Latin triangulātiō
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The story

  1. Medieval Latin · derived fromtriangulātiō“triangulation”
  2. English todaytriangulation

From Medieval Latin triangulātiō (“triangulation”), from triangulō (“to triangulate”) + -tiō (noun-forming suffix). Triangulō is derived from triangulus (“triangular; triangle”), from trēs (“three”) + angulus (“angle; corner”). By surface analysis, triangulate + ion; cognate with French triangulation.

Etymology from Wiktionary, CC BY-SA 4.0.