Can someone explain the word until to me?

Matthew 1:25New American Bible: Revised Edition
He had no relations with her until she bore a son, and he named him Jesus.
- That first reply makes sense. I think this software is going to work great for study interactions
- I really like the thought about there being no convent or anything for a woman to join. So anybody who wanted to live a life dedicated to God would find a man to "marry" as a protector.
- And also, there was something else I came across that claimed that nobody ever prophesied that the Messiah would also be the son of God. Is this true?