# trigonometry

[trig-uh-nom-i-tree]

- 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.

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## Origin of trigonometry^{}

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Related Words

calculationcalculusgeometrymathalgebradivisionadditionmultiplicationsubtractionnumberstrigonometry## Examples from the Web for trigonometry

### Historical Examples

#### It signifies an enormous number of things, from pot-hooks to trigonometry.

The Curse of EducationHarold E. Gorst

#### This is not because the details of trigonometry are all needed in physics.

College TeachingPaul Klapper

#### I worked off a year's trigonometry that summer, and began Virgil alone.

My AntoniaWilla Cather

#### They found them deficient in trigonometry and canned them off the team.

At Good Old SiwashGeorge Fitch

#### I never saw him but during a fortnight, when I took it into my head to do trigonometry.

Rowlandson's OxfordA. Hamilton Gibbs

## trigonometry

- 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

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## Word Origin

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

### n.

"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)).

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Online Etymology Dictionary, © 2010 Douglas Harper

## trigonometry

[trĭg′ə-nŏm′ĭ-trē]

- The study of the properties and uses of trigonometric functions.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.