operi

operi is a Latin form of opus, meaning “work, task; (opus est) there is need of”. It is the dative singular neuter noun.

Found 120 times in the Latin texts on Socratos.

Where it is used

Caesar, De Bello Gallico 5.40.2: Noctu ex materia, quam munitionis causa comportaverant, turres admodum CXX excitantur incredibili celeritate; quae deesse operi videbantur, perficiuntur.

Petronius, Satyricon 141: … beo quod timeam. Sequetur imperium, si promiseris illi pro unius horae fastidio multorum bonorum pensationem. Operi modo oculos et finge te non humana viscera sed centies sestertium comesse. Accedit hue, quod aliqua inveniemu …

All forms of opus (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.