vigiliis
vigiliis is a Latin form of vigilia, meaning “watch, guard; a watch (one of four divisions of the night)”. It is the ablative plural feminine noun.
Found 71 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 5.31.4: Consumitur vigiliis reliqua pars noctis, cum sua quisque miles circumspiceret, quid secum portare posset, quid ex instrumento hibernorum relinquere cogeretur.
Livy, Ab urbe condita 2.65.1: ubi inluxit, Romanus integer satiatusque somno productus in aciem fessum stando et uigiliis Uolscum primo impetu perculit;
All forms of vigilia (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.