TRIGONOM'ETRY, noun [Gr. a triangle, and to measure.] The measuring of triangles; the science of determining the sides and angles of triangles, by means of certain parts which are given. When this science is applied to the solution of plane triangles, it is called plane trigonometry; when its application is to spherical triangles, it is called spherical trigonometry
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.