| Acronym | Definition |
|---|
| MAIN | Maintenance |
| MAIN | Multi Access Interactive Network |
| MAIN | Mountain Area Information Network (rural cooperative; North Carolina) |
| MAIN | Mid-America Interconnected Network |
| MAIN | Midwest Alliance in Nursing |
| MAIN | Manitoba Archival Information Network |
| MAIN | Militarism, Alliances, Imperialism and Nationalism (causes of WW I) |
| MAIN | Matériaux, Interfaces et Nanostructures |
| MAIN | Maine Association of Independent Neighborhoods |
| MAIN | Metropolitan Area Interconnect Network (Sigma Networks) |
| MAIN | Military Authorization Identification Number |
| MAIN | Montana Advanced Intelligent Network |