| | AAMOF | | as a matter of fact |
| | AAMOI | | As A Matter Of Interest |
| | AAMP | | advanced architecture microprocessor |
| | AAMP | | asian apartment massage parlors |
| | aar | | at any rate |
| | AAR8 | | At Any Rate |
| | AARP | | American Association of Retired Persons |
| | AARP | | Appletalk address resolution |
| | AAS | | Alive and smiling |
| | AASHTA | | As always, Sheldon has the answer |
| | AATK | | Always At The Keyboard |
| | AAYF | | as always, your friend |
| | AB/DL | | adult babies diaper lovers |
| | ABAICR | | As best as I can remember |
| | ABAIR | | As best as I remember |
| | ABBET | | A Braod Based Environment For Testing |
| | abcd | | Above and Beyond the Call of Duty |
| | abcd | | American Born Confused Desi |
| | ABCL | | As Built Configuration List |
| | abd | | all but dissertation |
| | ABITHIWTIDB | | A bird in the hand is worth two in the bush |
| | ABN | | Australian Business Number |
| | abs | | abdominal muscles |
| | abs | | absolute |
| | abs | | Antilock Braking System |
| | abv | | alcohol by volume |
| | ACD | | Alt Control Delete |
| | ACE | | Access Control Entry |
| | ACE | | Application Computing Environment |
| | ACK | | acknowledgement |
|