| Acronym | Definition |
|---|
| PEI➣Prince Edward Island (Canada) |
| PEI➣Petroleum Equipment Institute (Tulsa, OK, USA) |
| PEI➣Plan Estrategico Institucional (Spanish: Institutional Strategic Plan; Peru) |
| PEI➣Prevention and Early Intervention (various locations) |
| PEI➣Pan-European Institute (Finland) |
| PEI➣Power Engineering International (magazine) |
| PEI➣Proyecto Educativo Institucional (Spanish: Institutional Education Project; Colombia) |
| PEI➣Private Equity International (various locations) |
| PEI➣Pacific Ethanol, Inc. (Sacramento, CA) |
| PEI➣Polyethylenimine |
| PEI➣Perry Ellis International (Miami, FL) |
| PEI➣Performance Efficiency Index |
| PEI➣Program for Environmental Informatics |
| PEI➣Pre Efi Initialization |
| PEI➣Produits Equipements Industriels (French magazine) |
| PEI➣Porcelain Enamel Institute |
| PEI➣Percutaneous Ethanol Injection |
| PEI➣Private Educational Institution (classification) |
| PEI➣Polyether Imide (thermoplastic) |
| PEI➣Paul-Ehrlich Institute (Germany) |
| PEI➣Playboy Enterprises International (Chicago, IL) |
| PEI➣Pacific Eye Institute (Suva, Fiji) |
| PEI➣Patient Education Institute (healthcare software) |
| PEI➣Photo Electronic Imaging (magazine) |
| PEI➣Physical Education Index (resource; Cambridge Scientific Abstracts) |
| PEI➣Penetrating Eye Injury |
| PEI➣Pack Expo International (Packaging Machinery Manufacturers Institute) |
| PEI➣Primary End Item |
| PEI➣Professional Engineering Institution (UK) |
| PEI➣Public Engagement Initiative (various locations) |
| PEI➣Private Equity Intelligence (now Preqin) |
| PEI➣Professional Education Institute |
| PEI➣Professional Engineers in Industry (division of NSPE) |
| PEI➣Plant Equipment, Inc. |
| PEI➣Precision Enterprises, Inc. (Florida) |
| PEI➣Photofabrication Engineering, Inc (Milford, MA) |
| PEI➣Prisma Energy International (Texas) |
| PEI➣Pereira, Colombia - Matecana (Airport Code) |
| PEI➣Paradox Entertainment, Inc. (Los Angeles, CA) |
| PEI➣Parque Eco-Industrial (Spanish: Eco-Industrial Park) |
| PEI➣PoeticExperiences, Inc. |
| PEI➣Principal End Item |
| PEI➣Potholes Every Inch |
| PEI➣Physical External Interface |
| PEI➣Proyecto Educativo Integral (Spanish; Guatemala) |
| PEI➣Pulmonary Interstitial Emphysema |
| PEI➣Primary Energy Intensity |
| PEI➣Photoelectric Injector |
| PEI➣Performance Effectiveness Index |
| PEI➣Profile for Enterprise Integration |
| PEI➣Prime Executive International |
| PEI➣Preliminary Equipment Index |
| PEI➣Positive Enemy Indication |
Pei - United States architect (born in China in 1917)