| Abbreviation | Definition |
|---|---|
| AST | Angle Sum Theorem |
| ASTM | Average Size of Test Measurements |
| AT | Affine Transform |
| ATAM | Advances in Theoretical and Applied Mathematics |
| ATCM | Asian Technology Conference in Mathematics |
| ATFT | Adaptive Time Frequency Transform |
| ATI | Asymmetric Triangle Inequality |
| ATMNYC | Association of the Teachers of Mathematics of New York City |
| ATR | Almost Totally Real |
| ATR | Arithmetical Transfinite Recursion |
| ATSM | Affine Term Structure Model |
| ATV | About The Value |
| AUC | area under (the) curve |
| AUC | Area Under the Curve |
| AUGC | Area Under the Growth Curve |
| AUP | Adjusted Unbiased Prediction |
| AV | Absolute Value |
| AV | Abstract Variable |
| AV | Argument Vector |
| AV | Asymptotic Variance |