/ ˌtrɪgəˈnɒmətri; NAmE -ˈnɑːm-/ noun
[ U ] the type of mathematics that deals with the relationship between the sides and angles of triangles
► trig·ono·met·ric / ˌtrɪgənəˈmetrɪk; NAmE / (also trig·ono·met·ric·al / -kl; NAmE /) adjective
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WORD ORIGIN
early 17th cent.: from modern Latin trigonometria (from trigon (via Latin from Greek trigōnon , neuter of trigōnos three-cornered) + -metry ).