Of course, prior means gone before, as in past history, or perhaps only a few moments ago; it happened prior to my arrival on the scene.
But it can also mean, quite confusingly, to something in the future, when trying to get out of a meeting by saying I’ve got a prior appointment.
If you are an aficionado of American police dramas, then you will be well acquainted with the prior, meaning a previous criminal conviction.
And for something quite different, a prior is a priest of sorts, who, to me, was named as such in the Middle Ages. A prior is below an Abbot and is head of a house of friars. By the way, the most notable friar I know is Friar Tuck
A prior could also be a magistrate in the medieval republic of Florence.
It is not to be confused with Pryer or Prier
Someone who pries into another’s business; the most notable prier is the woman across the road from Samantha, in Bewitched.