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Trigonometrical

 - 3 dictionary results

trig⋅o⋅nom⋅e⋅try

  [trig-uh-nom-i-tree]
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–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; < NL trigōnometria; see trigon, -o-, -metry

Related forms:
trig⋅o⋅no⋅met⋅ric  [trig-uh-nuh-me-trik] , trig⋅o⋅no⋅met⋅ri⋅cal, adjective
trig⋅o⋅no⋅met⋅ri⋅cal⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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trig·o·nom·e·try   (trĭg'ə-nŏm'ĭ-trē)   
n.  The branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions.

[New Latin trigōnometria : Greek trigōnon, triangle; see trigon + Greek -metriā, -metry.]
trig'o·no·met'ric (-nə-mět'rĭk), trig'o·no·met'ri·cal (-rĭ-kəl) adj., trig'o·no·met'ri·cal·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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