# trigonometry

> English word · Noun · IPA /ˌtɹɪɡəˈnɒmətɹi/ · frequency rank #39,135

## Definitions
1. The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships.

## Etymology
PIE word
 *tréyes
From 1610s, from New Latin trigōnometria, from Ancient Greek τρίγωνον (trígōnon, “triangle”) + μέτρον (métron, “measure”), equivalent to trigono- + -metry.

## Common misspellings (19)
`rtigonometry`, `tirgonometry`, `trgionometry`, `triggonometry`, `trignoometry`, `trigonmoetry`, `trigonnometry`, `trigonoemtry`, `trigonomerty`, `trigonometrry`, `trigonometryy`, `trigonomettry`, `trigonometyr`, `trigonommetry`, `trigonomtery`, `trigoonmetry`, `triognometry`, `trrigonometry`, `ttrigonometry`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/trigonometry