Bdag

= A Greek-English Lexicon of the New Testament and Other Early Christian Literature (3rd ed.), by Bauer, Danker, Arndt, Gingrich. It's the standard scholarly lexicon for New Testament (Koine) Greek.

It looks like you're asking for a guide on — but this term is ambiguous without more context. Below are the most common meanings, each with a quick guide. Please check which one fits your situation. = A Greek-English Lexicon of the New Testament

BDAG is exhaustive. It cites not only every occurrence of a word in the New Testament but also references the Septuagint (Greek Old Testament), the Apostolic Fathers, and secular Greek papyri. This allows the user to see how a word was used in legal documents, personal letters, and receipts from the same time period, grounding biblical vocabulary in real-world usage. Below are the most common meanings, each with a quick guide