primae
primae is a Latin form of primus, meaning “first, foremost”. It is the nominative plural feminine numeral or genitive singular feminine adjective.
Found 147 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 2.19.5: … quam quem ad finem porrecta [ac] loca aperta pertinebant cedentes insequi auderent, interim legiones VI quae primae venerant, opere dimenso, castra munire coeperunt.
Pliny the Younger, Epistulae 10.60.2: Quae tamen, mi Secunde carissime, non eo pertinent, ut si quid illi novi criminis obicitur, minus de eo audiendum putes. Libellos Furiae Primae accusatricis, item ipsius Archippi, quos alteri epistulae tuae iunxeras, legi.
All forms of primus (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.