trigonometry
/ˌtɹɪɡəˈnɒmətɹi/ noun
Forms trigonometries
- noun (geometry, mathematical analysis) The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships. “Historically, trigonometry has been applied in areas such as geodesy, surveying, celestial mechanics and navigation.”
Synonyms
Etymology
From 1610s, from New Latin trigōnometria, from Ancient Greek τρίγωνον (trígōnon, “triangle”) + μέτρον (métron, “measure”), equivalent to trigono- + -metry.
Webster’s 1913
- noun That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.
- noun A treatise in this science. Analytical trigonometry, that branch of trigonometry which treats of the relations and properties of the trigonometrical functions.
Etymology [Gr. -metry: cf. F. trigonométrie. See Trigon.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “trigonometry”, CC BY-SA 4.0. Details