Definition of "trigonometry"
trigonometry
/ˌtɹɪɡəˈnɒmətɹi/
noun
countable and uncountable, plural trigonometries
(geometry, mathematical analysis) The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships.