Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun 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.
from The Century Dictionary.
 noun The mathematical doctrine of the calculation of the angles, sides, and areas of triangles, plane and spherical, together with that of other quantities intimately related to those. Trigonometry embraces also goniometry, or the elementary theory of singly periodic functions.
from the GNU version of the Collaborative International Dictionary of English.
 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.
 noun that branch of trigonometry which treats of the relations and properties of the trigonometrical functions.
 noun those branches of trigonometry in which its principles are applied to plane triangles and spherical triangles respectively.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun mathematics The branch of
mathematics that deals with therelationships between thesides and theangles oftriangles and thecalculations based on them, particularly thetrigonometric functions .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun the mathematics of triangles and trigonometric functions
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

The term trigonometry was not used until the close of the sixteenth century.
LearnHub Activities 2008

It makes me wonder if a kid who had no interest in trigonometry or symbolism in literature could grow up without ever learning those things and be okay.

Every edition released by the publisher has literally no new information (I can't imagine very many discoveries in trigonometry make their way into textbooks each year), but all new homework assignments.
Boing Boing 2009

You'd have to have advanced degrees in trigonometry and geometry to scale the heights of that number.
Mike Alvear: What If He Doesn't Look Anything Like His Pictures? Mike Alvear 2010

You'd have to have advanced degrees in trigonometry and geometry to scale the heights of that number.
Mike Alvear: What If He Doesn't Look Anything Like His Pictures? Mike Alvear 2010

It makes me wonder if a kid who had no interest in trigonometry or symbolism in literature could grow up without ever learning those things and be okay.

Every edition released by the publisher has literally no new information (I can't imagine very many discoveries in trigonometry make their way into textbooks each year), but all new homework assignments.
Boing Boing 2009

Every edition released by the publisher has literally no new information (I can't imagine very many discoveries in trigonometry make their way into textbooks each year), but all new homework assignments.
Boing Boing 2007

Every edition released by the publisher has literally no new information (I can't imagine very many discoveries in trigonometry make their way into textbooks each year), but all new homework assignments.
Boing Boing 2007

Every edition released by the publisher has literally no new information (I can't imagine very many discoveries in trigonometry make their way into textbooks each year), but all new homework assignments.
Boing Boing 2007
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