# 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.

## RELATED CONTENT

## RELATED WORDS

calculation, calculus, geometry, math, algebra, division, addition, multiplication, subtraction, numbers

## Nearby words

- trigonocephaly,
- trigonometric equation,
- trigonometric function,
- trigonometric functions,
- trigonometric series,
- trigonous,
- trigonum,
- trigram,
- trigraph,
- trigraphic

## Origin of trigonometry

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Examples from the Web for trigonometry

## trigonometry

### noun

## Word Origin for trigonometry

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

## trigonometry

"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)).

Online Etymology Dictionary, © 2010 Douglas Harper

## trigonometry

[trĭg′ə-nŏm′ĭ-trē]

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