fiunt
fiunt is a Latin form of fio, meaning “become, be made; happen”. It is the 3rd person plural present active indicative.
Found 343 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 6.23.6: Latrocinia nullam habent infamiam, quae extra fines cuiusque civitatis fiunt, atque ea iuventutis exercendae ac desidiae minuendae causa fieri praedicant.
Plautus, Bacchides 5.2.1197b: Mel méum, amabo, etsi haec fíunt,
Ammianus Marcellinus, Res Gestae 17.7.13: Fiunt autem terrarum motus modis quattuor: aut enim brasmatiae sunt, qui humum more aestus imitus suscitantes, surs …
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.