adv. [f. prec. + -LY2.] In a trigonometrical manner; by means, or by the method, of trigonometry.
1666. Collins, in Rigaud, Corr. Sci. Men (1841), I. 115. Problems that seem easy trigonometrically, but not so analytically.
1751. J. Stuart, in Lett. Lit. Men (Camden), 382. An exact Map of all the Province of Attica trigonometrically surveyed.
1859. R. F. Burton, Centr. Afr., in Jrnl. Geog. Soc., XXIX. 8. Such as cannot be ascended should be measured trigonometrically.
