| Abbreviation | Definition |
|---|---|
| APAM | Advances in Pure and Applied Mathematics |
| APAM | Applied Physics and Applied Mathematics |
| API | Allocation Programming Interface |
| APM | Arbitrary Precision Mathematics |
| APME | Annual Perspectives in Mathematics Education |
| apo | apothem |
| APP | A Posteriori Probability |
| APP | Algebraic Path Problem |
| APT | Adaptive Prediction Tree |
| APT | Almost Polynomial Time |
| AQ | Accuracy Quotient |
| AQ | Advanced Queuing |
| AQIS | Applied Quantitative Information Technology |
| ARCH | Auto Regressive Conditional Heteroscedasticity |
| AREM | Additional Rule Evaluation Measures |
| ARMT | Alabama Reading and Mathematics Test |
| ART | Algebraic Reconstruction Technique |
| ARTIST | Assessment Resource Tools to Improve Statistical Thinking |
| AS | Addressing System |
| AS | Almost Symmetrical |