completum
Completum is the neuter singular perfect passive participle of the Latin verb compleo, meaning to fill or to complete. In Latin, participles can function as adjectives or as nouns; completum commonly denotes “that which is completed” or “the completed thing” when used substantively.
It belongs to the participial paradigm completus (masculine), completa (feminine), completum (neuter). As a neuter adjective
Typical phrases include opus completum (“a completed work”) and, less commonly, res completum in early legal
Today completum is mainly of interest to students of Latin grammar and historical linguistics. It is not