AB can have several meanings depending on context. Here are common definitions:

• Bachelor of Arts (BA) or its Latin form Artium Baccalaureus sometimes abbreviated AB in older or specific academic traditions.

• Able Seaman or Able-bodied Seaman, terms used in maritime contexts for skilled deck crew or a rating on ships.

• Alberta, the Canadian province, used as a postal/territorial abbreviation in addresses.

• Abbreviation for abortion/abortive in medical or shorthand usage.

• Other specialized uses include Ab (abbreviation in linguistics), antibody in medical contexts, and various technical meanings (e.g., aggregate base in engineering, ApacheBench as a benchmarking tool, etc.). The exact meaning is usually clear from surrounding text.

If you can share the particular field or sentence where you saw “AB,” I can pinpoint the most likely meaning.