What does ad mean in reference to the bible?

"Ad" in reference to the Bible is a shortened form of the Latin word "ad" meaning "to" or "toward." It's often used in conjunction with a book or chapter number, indicating a specific location within the Bible.

For example:

* "Ad Galatas" means "to the Galatians," referring to the Epistle to the Galatians.

* "Ad Romanos" means "to the Romans," referring to the Epistle to the Romans.

* "Ad 1 Cor. 1:1" means "to 1 Corinthians 1:1," referring to the first chapter, first verse of the First Letter to the Corinthians.

Essentially, "ad" acts as a preposition, directing the reader to a specific part of the Bible.