Oh absolutely there will be people to whom it's new, but it's up there with phrases like "quid pro quo", "pro bono", or "quod erat demonstrandum" - https://en.w

Oh absolutely there will be people to whom it's new, but it's up there with phrases like "quid pro quo", "pro bono", or "quod erat demonstrandum" - https://en.wikipedia.org/wiki/Q.E.D https://en.wikipedia.org/wiki/Q.E.D. - which aren't all that rare. Et cetera of course is the cool kid amongst Latin stuff we borrow today :-)