Borrowed from Old French oste (“innkeeper, landlord”), which is from Latin hospitem, the accusative singular of hospes.
From the same Latin source: Italian ospite (a doublet).
oste m (plural osti, feminine ostessa)
- innkeeper, landlord (proprietor of an osteria)
From Latin hostem, accusative singular of hostis (“enemy, stranger”), from Proto-Italic *hostis, from Proto-Indo-European *gʰóstis (“guest, stranger”).
oste m (plural osti)
- army or host, especially that of the enemy