| Acronym | Definition |
|---|
| MECA | Maine College of Art |
| MECA | Middle East Children's Alliance |
| MECA | Maritime Electronic Commerce Association |
| MECA | Manufacturers of Emission Controls Association (Washington, DC) |
| MECA | Mars Environmental Compatibility Assessment (NASA JPL) |
| MECA | Marriage Equality California |
| MECA | Montana Electric Cooperatives Association |
| MECA | Metropolitan Emergency Communications Agency (Marion County, Indiana) |
| MECA | Middle East Citizens Assembly |
| MECA | Muslim Educational and Cultural Association |
| MECA | Museum of Ephemeral Cultural Artifacts |
| MECA | Metal Castings |
| MECA | Malleable Embedded Communications Accelerator |
| MECA | Minority E-Commerce Association |
| MECA | Medical Equipment Compliance Associates, LLC (Oak Creek, WI) |
| MECA | Michigan Exploratory Center on the Demography of Aging |
| MECA | Manitou Environmental Citizens Action |
| MECA | Missile Electronics Computer Assembly |
| MECA | Map Exercise Computer Assistance |
| MECA | Modification, Extension, and Consolidation Agreement |
| MECA | Michigan Electrical Contractors Association |
| MECA | Microwave Electronic Components of America (Denville, NJ) |