trigonometry /ˌtrɪgəˈnɑːmətri/ noun Learner's definition of TRIGONOMETRY
[noncount]
: a branch of mathematics that deals with relationships between the sides and angles of triangles三角学
— trigonometric
/ˌtrɪgənəˈmɛtrɪk/ also trigonometrical /ˌtrɪgənəˈmɛtrɪkəl/ adjective — trigonometrically
/ˌtrɪgənəˈmɛtrɪkli/ adverb