## trigonometrical

Variant of 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