I am assuming that you are Catholic as you are in the Catholic Answers forum. If so, I am shaking my head in complete disbelief that any Catholic need ask such a basic question.
Did you “learn” your Faith sometime after 1965? Just asking.
There are quite a lot of Catholics who know no Latin, including those of the other Catholic Churches and converts. The teaching of basic Latin is ignored in parishes, so it does not surprise me that someone would have this question.
If one was raised learning prayers in the vernacular and never attended Latin classes, one might not know what Ave means. The only place I come across it in Latin texts is in the formula *Ave atque vale * (Hail and farewell).
I would guess that if you asked Catholics what *Ave * means, you might get a variety of responses. English rarely uses the word Hail anymore as a greeting; that might be part of the issue.