pervĭgĭlātĭo, ōnis, f. [pervigil],
a devotional watching , a vigil : nocturnae pervigilationes, Cic. Leg. 2, 15, 37.
pervigilātiō ōnis, f pervigilo, a devotional watching, vigil : nocturnae pervigilationes. ...
An Elementary Latin Dictionary