| Abbreviation | Definition |
|---|---|
| ACLP | Afeka Center for Language Processing |
| ACSL | Advanced Continuous Simulation Language |
| ACW | Alliance for Computers and Writing |
| ADDL | Artifact and Design Description Language |
| ADFL | Arena Data Flow Language |
| ADL | Adventure Development Language |
| ADL | Animation Description Language |
| ADL | Assertion Definition Language |
| ADLCJ | Association pour le Développement de la Langue et de la Culture Japonaise (French: Association for the Development of Japanese Language and Culture) |
| ADLI | Autism Developmental Language Impairments |
| ADLT | Assertion Definition Language Translator |
| ADTLP | Armywide Doctrinal and Training Literature Program |
| ADV | Adverb |
| AEIOU | AEIOU and sometimes Y - All Vowels in the English alphabet |
| AEL | Arithmetic Expression Language |
| AEL | Asterisk Extension Language |
| AELA | Aoraki English Language Academy |
| AELD | Academic English Language Development |
| AELP | Academic English Language Program |
| AELP | Accelerated English Language Program |