vesperae

Substantivisation of relational Late Latin vesperus (“evening”).

vesperae f pl (genitive vesperārum); first declension

1. (Ecclesiastical Latin) vespers (evening prayer service)

First-declension noun, plural only.

vesperae

1. inflection of vespera (“evening”):
   1. nominative/vocative plural
   2. genitive/dative singular

• "vesperae", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)