| 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) |