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.

1605–15; < Neo-Latin trigōnometria; see trigon, -o-, -metry

trigonometric [trig-uh-nuh-me-trik] , trigonometrical, adjective
trigonometrically, adverb
nontrigonometric, adjective
nontrigonometrical, adjective
nontrigonometrically, adverb
untrigonometric, adjective
untrigonometrical, adjective
untrigonometrically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trigonometry (ˌtrɪɡəˈnɒmɪtrɪ)
trig 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, etc
[C17: from New Latin trigōnometria from Greek trigōnon triangle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"branch of mathematics that deals with relations between sides and angles of triangles," 1614, from Mod.L. trigonometria (Barthelemi Pitiscus, 1595), from Gk. trigonon "triangle" (from tri- "three" + gonia "angle;" see knee) + metron "a measure" (see meter (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
trigonometry   (trĭg'ə-nŏm'ĭ-trē)  Pronunciation Key 
The study of the properties and uses of trigonometric functions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He invented tools for computation, navigation and surveying, and devised the trigonometry concepts of cosine and cotangent.
Remembering her fun in working with trigonometry, she realizes that she needs to adjust the length of the pendulum.
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