salvo

Salvo likely comes from Latin salva, meaning a salute or volley, itself from salve, the standard Roman greeting meaning 'hail.' A separate legal thread traces to salvo jure, Latin for 'the right being reserved,' from salvus meaning 'safe' or 'preserved.'

The word entered English as salva in 1591 to describe a simultaneous discharge of guns, then was altered to its current spelling, salvo, by 1719.

It shares a root with salvere, 'to be in good health' — the same idea behind the Roman greeting salve, which still surfaces in English as a form of hello in some contexts.