seu
seu is a Latin form of sive, meaning “or if; whether ... or”. It is the conjunction.
Found 950 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.23.3: Helvetii, seu quod timore perterritos Romanos discedere a se existimarent, eo magis quod pridie superioribus locis occupati …
Vergil, Georgics 3.49: Seu quis Olympiacae miratus praemia palmae
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.