What does Leviticus 21:3 mean?

and for his sister a virgin, that is near unto him, that hath had no husband; for her may he defile himself.

And for his sister a virgin, that is nigh unto him, which hath had no husband; for her may he be defiled.

and for his sister a virgin, that is near unto him, that hath had no husband; for her may he defile himself.

And for his sister, a virgin, for she is his near relation and has had no husband, he may make himself unclean.

and for his sister, the virgin, who is near unto him, who hath not been to a man; for her he is defiled.

And for a maiden sister, who hath had no husband.

and for his sister, a virgin, that is near unto him, who hath had no husband, for her may he make himself unclean.