fidei

fidei is a Latin form of fides, meaning “faith, trust; loyalty; promise”. It is the dative singular feminine noun or genitive singular feminine noun.

Found 314 times in the Latin texts on Socratos.

Where it is used

Caesar, De Bello Gallico 5.3.7: itaque esse civitatem in sua potestate, seseque, si Caesar permitteret, ad eum in castra venturum, suas civitatisque fortunas eius fidei permissurum.

Cicero, De Natura Deorum 3.88: … m est, fortunam a deo petendam, a se ipso sumendam esse sapientiam. quamvis licet Menti delubra et Virtuti et Fidei consecremus, tamen haec in nobis ipsis sita videmus; spei salutis opis victoriae facultas a dis expetenda est …

All forms of fides (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.