WordReference Random House Learner's Dictionary of American English © 2025
trig•o•nom•e•try /ˌtrɪgəˈnɑmɪtri/USA pronunciation
n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2025- Mathematicsthe branch of mathematics that deals with the relations between the sides and angles of triangles:a course in trigonometry.
trig•o•nom•e•try
(trig′ə nom′i trē),USA pronunciation n.
trig•o•no•met•ric
(trig′ə nə me′trik)USA pronunciation, trig′o•no•met′ri•cal, adj.
trig′o•no•met ′ri•cal•ly, adv.
- 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.
- Neo-Latin trigōnometria; see trigon, -o-, -metry
- 1605–15;
'trigonometric' also found in these entries (note: many are not synonyms or translations):
arc
- circular function
- cosecant
- cosine
- cotangent
- elementary function
- elliptic function
- harmonic analysis
- reduction formula
- secant
- sine
- slide rule
- tangent
- trig
- trig function
- trig point
- trigon
- trigonometric equation
- trigonometric function
- trigonometric series
- trigonometry
- versed sine