The word “Ab” can refer to several things depending on the context:
1. **Abbreviation**: It is often used as an abbreviation for “abdominal,” particularly in fitness contexts where it refers to abdominal muscles (e.g., “doing ab exercises”).
2. **In Music**: “Ab” can refer to the musical note A-flat, which is one semitone lower than A.
3. **In Latin**: “Ab” is a preposition meaning “from” or “away from,” often used in various English phrases or terms derived from Latin.
If you have a specific context in mind for “Ab,” please provide it for a more precise definition!