# trigonometry

[ trig-uh-nom-i-tree ]

/ ˌtrɪg əˈnɒm ɪ tri /

### 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 WORDS

## Nearby words

Related forms

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

## Examples from the Web for trigonometry

## British Dictionary definitions for trigonometry

## trigonometry

/ (ˌtrɪɡəˈnɒmɪtrɪ) /

### noun

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

Derived Formstrigonometric (ˌtrɪɡənəˈmɛtrɪk) or trigonometrical, adjectivetrigonometrically, adverb

## 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

## Word Origin and History for trigonometry

## 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

## Science definitions for trigonometry

## trigonometry

[ trĭg′ə-nŏm′ĭ-trē ]

The study of the properties and uses of trigonometric functions.

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