Again ordinarily means back, once more, or anew. It may also function as a connective meaning “moreover.” In expressions such as “born again,” it conveys renewal or new birth.
The New Testament generally uses the word for “back” or “once more,” though it can mean “moreover.” “Born again” is rendered “born anew” in the Revised Version.
The underlying particles may also carry the ideas “from above” and “up,” so the full force of “again” in the new-birth expression has been discussed.