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English definition of “trigonometry”

trigonometry

noun [U]     /ˌtrɪɡ.əˈnɒm.ə.tri/ US  /-ˈnɑː.mə-/ (informal trig)
a type of mathematics that deals with the relationship between the angles and sides of triangles , used in measuring the height of buildings , mountains , etc.: Trigonometry concerns the functions of angles , such as sine , cosine , and tangent .Branches and types of mathematics
(Definition of trigonometry noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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