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trigonometry

American  
[trig-uh-nom-i-tree] / ˌtrɪg əˈnɒm ɪ tri /

noun

  1. 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.

trigonometry British  
/ ˌtrɪɡəˈnɒmɪtrɪ, ˌtrɪɡənəˈmɛtrɪk /

noun

  1.  trig.  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, etc

"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 Scientific  
/ trĭg′ə-nŏm′ĭ-trē /

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

Other Word Forms

  • nontrigonometric adjective
  • nontrigonometrical adjective
  • nontrigonometrically adverb
  • trigonometric adjective
  • trigonometrical adjective
  • trigonometrically adverb
  • untrigonometric adjective
  • untrigonometrical adjective
  • untrigonometrically adverb

Etymology

Origin of trigonometry

1605–15; < New Latin trigōnometria; trigon, -o-, -metry

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He said after realising he had seen an exam question, instead of alerting the exam board, he deleted the image containing the trigonometry question.

From BBC

“You were never going to teach a first grader a trigonometry lesson, right?” she said.

From Seattle Times

Functions and trigonometry came easily, but the basics gave him trouble.

From Seattle Times

"I have lost count of the number of people who say they wish they had learnt about mortgages rather than trigonometry," she said.

From BBC

Two high school students have proved the Pythagorean theorem in a way that one early 20th-century mathematician thought was impossible: using trigonometry.

From Scientific American

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.