- Trigonometry is defined as the branch of math that deals with calculations related to the sides and angles of triangles.
An example of trigonometry is what architects use to calculate distances.

## trigonometry

noun

*pl.*trigonometries

the branch of mathematics that deals with the ratios between the sides of a right triangle with reference to either acute angle (

*trigonometric functions*), the relations between these ratios, and the application of these facts in finding the unknown sides or angles of any triangle, as in surveying, navigation, engineering, etc.Origin of trigonometry

Modern Latin*trigonometria*; from Classical Greek

*trigōnon,*triangle (see trigon) +

*-metria,*measurement (see -metry)

*Related Forms:*

- trigonometric
adjective

or trigonometrical - trigonometrically
adverb

## trigonometry

noun

The branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions.

Origin of trigonometry

New Latin*trigōnometria*: Greek

*trigōnon*,

*triangle*; see

**trigon**+ Greek

*-metriā*,

*-metry*.

*Related Forms:*

**trig′o·no·met′ric**,**trig′o·no·met′ri·cal**adjective

**trig′o·no·met′ri·cal·ly**adverb

## trigonometry

Noun

(*countable and uncountable*, *plural* trigonometries)

- (mathematics) The branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions.

Origin

From New Latin *trigonometria*, from Ancient Greek *τρίγωνον* (trigōnon, “triangle”) + *-metria* (“-metry”).