trigonometry

 /ˌtrɪɡəˈnɒmɪtrɪ/

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WordReference Random House Learner's Dictionary of American English © 2016
trig•o•nom•e•try /ˌtrɪgəˈnɑmɪtri/USA pronunciation   n. [uncountable]
  1. Mathematicsthe branch of mathematics that deals with the relations between the sides and angles of triangles:a course in trigonometry.
trig•o•no•met•ric /ˌtrɪgənəˈmɛtrɪk/USA pronunciation  adj. See -meter-.

WordReference Random House Unabridged Dictionary of American English © 2016
trig•o•nom•e•try  (trig′ə nomi trē), 
n. 
  1. the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them.
Etymology:1605–15; Neo-Latin trigōnometria;
see trigon, -o-, -metry
trig•o•no•met•ric (trig′ə nə metrik) 
, trig′o•no•metri•cal,adj. 
trig′o•no•metri•cal•ly,adv. 


Collins Concise English Dictionary © HarperCollins Publishers::

trigonometry /ˌtrɪɡəˈnɒmɪtrɪ/ n
  1. the branch of mathematics concerned with the properties of trigonometric functions and their application to the determination of the angles and sides of triangles. Used in surveying, navigation, etc
Etymology: 17th Century: from New Latin trigōnometria from Greek trigōnon triangle

trigonometric /ˌtrɪɡənəˈmɛtrɪk/, ˌtrigonoˈmetrical adj



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