# trigonometric

## trigonometry

[trig-uh-nom-i-tree]
noun
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:
1605–15; < Neo-Latin trigōnometria; see trigon, -o-, -metry

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World English Dictionary
 trigonometry (ˌtrɪɡəˈnɒmɪtrɪ) —n 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] trigonometric —adj trigono'metrical —adj trigono'metrically —adv

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Etymonline
Word Origin & History

trigonometry
"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