[ trig-uh-nom-i-tree ]
/ ˌtrɪg əˈnɒm ɪ tri /


the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them.

Origin of trigonometry

1605–15; < New Latin trigōnometria; see trigon, -o-, -metry
Related forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for trigonometry

British Dictionary definitions for trigonometry


/ (ˌtrɪɡəˈnɒmɪtrɪ) /


the branch of mathematics concerned with the properties of trigonometric functions and their application to the determination of the angles and sides of triangles. Used in surveying, navigation, etcAbbreviation: trig
Derived Formstrigonometric (ˌtrɪɡənəˈmɛtrɪk) or trigonometrical, adjectivetrigonometrically, adverb

Word Origin for trigonometry

C17: from New Latin trigōnometria from Greek trigōnon triangle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for trigonometry



"branch of mathematics that deals with relations between sides and angles of triangles," 1610s, from Modern Latin trigonometria (Barthelemi Pitiscus, 1595), from Greek trigonon "triangle" (from tri- "three," see tri-, + gonia "angle," see knee (n.)) + metron "a measure" (see meter (n.2)).

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for trigonometry


[ trĭg′ə-nŏmĭ-trē ]

The study of the properties and uses of trigonometric functions.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.