APEI
| Acronym | Definition |
|---|---|
| APEI | Arkansas Power Electronics International, Inc. (Fayetteville, AR) |
| APEI | American Public Education Incorporated (Charles Town, VA) |
| APEI | Association de Parents et Amis de Personnes Handicapées Mentales |
| APEI | Armor Piercing Explosive Incendiary |
| APEI | Axial Plaque Extension Index (periodontology) |
| APEI | Asosiasi Profesional Elektrikal Indonesia (Indonesian: Electrical Professionals Association of Indonesia) |
| APEI | ACPI (Advanced Configuration and Power Interface) Platform Error Interface (Linux) |