evolution Copy link • evolution: military, dēcursus, ūs; dēcursio (terms applied to the e.s of troops on parade): Tac. A. 2, 55 [decursibus cohortium interesse], Suet. Galb. 6, fin. [campestris decursio]. Phr.: to go through e.s, decurrere: often impers., they went through their e.s under arms, in annis decursum est, Liv. 26, 51, med.: Tac.: to go through various e.s (of horses), gyros variare, Tac. Ger. 6.