'cause - adjoining
- AARC Anglo-American Cataloging Rules
- aard-wolf
- AAS associate in applied science
- AAUN American Association for the United Nations
- AAUP American Association of University Professors
- AB Bachelor of Arts
- ab-
- ABA
- abaca
- aback
- abaction
- abacus
- Abaddon
- abaft
- abandon
- abandon a custom
- abandon all hope
- abandon the attempt
- abandon to
- abandoned