What does excŭbātĭo mean in Latin?

excŭbātĭo, a noun, means “a watching”.

noun

excŭbātĭo

excŭbātĭo, ōnis, f. excubo,

I. a watching, keeping watch. *

I. Lit.: ab excubatione desistere, Dig. 49, 16, 3, § 6.—*

II. Trop.: perpetua pro dignitate et salute amicorum, Val. Max. 4, 7, 7.