Reply #117: But in context, the modern meaning does appear appropriate

[muriel_volestrangler]

"You will be with child and give birth to a son, and you are to give him the name Jesus. He will be great and will be called the Son of the Most High. The Lord God will give him the throne of his father David, and he will reign over the house of Jacob forever; his kingdom will never end.”“How will this be,” Mary asked the angel, “since I am a virgin?”
The angel answered, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you. So the holy one to be born will be called the Son of God."

Luke 1:31-35.

So, if you take Luke as reliable, Mary realised that this was not the normal process.