potestatis
potestatis is a Latin form of potestas, meaning “power, authority; ability, opportunity (to do something)”. It is the genitive singular feminine noun.
Found 129 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 4.16.4: populi Romani imperium Rhenum finire; si se invito Germanos in Galliam transire non aequum existimaret, cur sui quicquam esse imperii aut potestatis trans Rhenum postularet?
All forms of potestas (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.