| Abbreviation | Definition |
|---|---|
| ACL | Adjective Checklist Psychology |
| ACRA | Adolescent Community Reinforcement Approach |
| ACT | Actualize Conscious Thought |
| AD | Arrested Development |
| ADC | After Death Communication |
| ADD | Advanced Discipline Deficit |
| ADOS | Attention Deficit? Oh, Shiney! |
| ADS | Alcohol Dependence Scale |
| ADSA | Attention Deficit Scale for Adults |
| ADT | Auditory Discrimination Test |
| AEP | Advanced Energy Psychology |
| AEPS | Applied Evolutionary Psychology Society |
| AES | Apathy Evaluation Scale |
| AFSP | American Foundation for Suicide Prevention |
| AGAP | Association of Graduates in Analytical Psychology |
| AGE | Aggressive Geriatric Elder |
| AGWBI | Adapted General Well-Being Index (psychology) |
| AH | After Humanity |
| AH | Auditory Hallucinations |
| AHCP | Association of Holistic Complementary Practitioners |