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From: Webster's Revised Unabridged Dictionary (1913)

 Trig·o·no·met·ric Trig·o·no·met·ric·al Of or pertaining to trigonometry; performed by the rules of trigonometry.
 --Trig*o*no*met*ric*al*ly, adv.
 Trigonometrical curve, a curve one of whose coordinates is a trigonometric function of the other.
 Trigonometrical function. See under Function.
 Trigonometrical lines, lines which are employed in solving the different cases of plane and spherical trigonometry, as sines, tangents, secants, and the like. These lines, or the lengths of them, are trigonometrical functions of the arcs and angles to which they belong.
 Trigonometrical survey. See under Survey.
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