AAAA

1. Amateur Athletic Association of America
2. American Association for the Advancement of Agnosticism
3. American Association for the Advancement of Atheism
4. American Association for Affirmative Action
5. American Association of Advertising Agencies
6. Antique Aeroplane Association of Australia
7. Antique Appraisal Association of America
8. Army Aviation Association of America
9. Associated Actors and Artists of America
10. SingaporeAssociation of Accredited Advertising Agencies
11. Australian Advertising Advisory Authority
12. Australian Association of Advertising Agencies
13. Australian Automotive Aftermarket Association
14. "Authentication, Authorization, Accounting, and Auditing", the four main services provided by an Internet Authentication Service.

plural AAAAs

1. A specific size and configuration of electric battery.
2. slangball gamesA baseball player who is too good for Minor League Baseball, but not good enough for Major League Baseball.
3. A type of DNS record used to indicate the IPv6 internet address of a DNS name.