a. [f. TRIGONOMETRY + -IC: perh. through F. trigonométrique (1762 in Dict. Acad.).] = next.
1811. Pinkerton, Petral., I. 184. The mountains, on which their trigonometric operations had conducted them.
1862. C. P. Smyth, Three Cities in Russia, II. 186. The trigonometric operations require the observer … to be for long periods under canvass.
