fiat
fiat is a Latin form of fio, meaning “become, be made; happen”. It is the 3rd person singular present active subjunctive.
Found 542 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 6.29.5: monet, ut ignes in castris fieri prohibeat, ne qua eius adventus procul significatio fiat: sese confestim subsequi dicit.
Martial, Epigrammata 8.82.8: Fiat et ex hedera civica nostra tibi.
Plautus, Captivi 2.1.214: Fíat. abscédite hinc: nós concedámus huc.
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.