| Acronym | Definition |
|---|
| AX | Axis |
| AX | Anime Expo (animation convention) |
| AX | Armani Exchange |
| AX | Axiom |
| AX | Account Register |
| AX | Accumulator |
| AX | Axillary (armpit) |
| AX | Automatic Transmission |
| AX | Arenacross (motor sports) |
| AX | Auto Cross |
| AX | Auxiliary Systems |
| AX | Alpha Chi Omega (sorority) |
| AX | Agility Excellent (AKC title) |
| AX | Alpha Chi National College Honor Society (est. 1922) |
| AX | Anion Exchanger |
| AX | American Express Company (credit card type) |
| AX | Architecture Extended |
| AX | X-Axis Acceleration |
| AX | Assess/Assessment |
| AX | AUXOP (AUXMIS) |
| AX | Anger-Expression Inventory |
| AX | Analyst Executive |
| AX | Arcade Extreme (game) |
| AX | Atlantic Coast Line Railroad Company |
| AX | Acceptance Requirements Index |
| AX | (USN Rating) Aviation Antisubmarine Warfare Technician |
| AX | Amman Exchange Co. |
| AX | Concept for Long Range Advanced Missile |