D / dēcursĭo
noun

dēcursĭo

gen. dēcursōnis · gender feminine · decl. 3rd
a running; flowing down
a running or flowing down (less freq. than decursus; not in Cic.).
In gen.: aquae, Arn. 2, p. 84.—
In gen.: aquae, Arn. 2, p. 84.—
a manœuvre, military exercise, evolution, a descent, hostile attack
In partic., milit. t. t., a manœuvre, military exercise, evolution, a descent, hostile attack, Brutus ap. Cic. Fam. 11, 10, 4; Hirt. B. G. 8, 24, 3; Auct. B. Alex. 42.—Hence,
a walking; running in complete armor by extension
Transf., a walking or running in complete armor at a solemnity or for exercise, Suet. Calig. 18; id. Galb. 6.