| Rank | Abbreviation | Meaning |
|---|
| ***** | AECI | Aero Club d'Italia (Italian National Aero Club)
| |
| **** | AECI | Agencia Espanola de Cooperacion Internacional (Spanish: Spanish International Cooperation Agency)
| |
| **** | AECI | Atomic Energy Commission Of India
| |
| *** | AECI | African Explosives and Chemical Industries
| |
| *** | AECI | Année européenne de la créativité et de l'innovation
| |
| *** | AECI | Agreement for Exchange of Confidential Information
| |
| ** | AECI | Affaires Etrangeres et du Commerce International
| |
| ** | AECI | Agencia Ejecutiva de Competitividad e Innovación
| |
| * | AECI | Art Exhibition Catalogue Index
| |
| * | AECI | Agencia Española de Cooperación Iberoamericana
| |
| * | AECI | angiotensin enzyme converter inhibitors
| |
| * | AECI | Alabama Electric Cooperative Inc
| |
| * | AECI | Aviation Engineering Consultants Inc
| |
| * | AECI | Australian Export Coal Industry
| |
| * | AECI | Association of Electrical Contractors of Ireland
| |
| * | AECI | Ad Express Canada Inc
| |
| * | AECI | Agencia Española para la Cooperación Internacional
| |
| * | AECI | American Electronic Components Inc
| |
| * | AECI | Associated Electric Coop Inc
| |
| * | AECI | Anchor Engineering Consultants Inc
| |
| * | AECI | Association of Electrical Contractors, Ireland
| |
| * | AECI | Associated Electric Cooperative Inc
| |
| * | AECI | Allegheny Electric Cooperative, Inc
| |
| * | AECI | Associated Electric Cooperative Incorporated
| |
| * | AECI | Advance Electronic Cargo Information
| |