“To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary.”
King James Version (KJV)
1:27 Espoused - It was customary among the Jews, for persons that married to contract before witnesses some time before. And as Christ was to be born of a pure virgin, so the wisdom of God ordered it to be of one espoused, that to prevent reproach he might have a reputed father, according to the flesh.
Lu 1:27 To a virgin. She was espoused; that is, formally engaged to Joseph, but not yet married. Compare with Mt 1:18-25.