| Abbreviation | Definition |
|---|---|
| MEAF | Matching Energy Assistance Fund |
| MEAN | Municipal Energy Agency of Nebraska |
| MEAR | Manifest Energy And Radiate |
| MEC | Mack Energy Corp |
| MEC | Mack Energy Corporation |
| MECB | Manitoba Energy Code for Buildings |
| MECC | Modular Energy Carrier concept |
| MECI | Minimum Energy Conical Intersection |
| MECO | Material Energy Chemicals and Other |
| MECO | Materials Energy Chemicals Other |
| MECO | Maximumbinding Energy Circular Orbit |
| MECO | Maximumbinding Energy Circular Orbit |
| MECO | Maximum–binding Energy Circular Orbit |
| MEDI | Meditate Energy Dream Insight |
| MEDREG | Mediterranean Energy Regulators |
| MEDS | Motion Energy Distribution System |
| MEE | Most Energy Efficient |
| MEEA | Massachusetts Environmental Energy Alliance |
| MEEA | Midwest Energy Efficiency Alliance |
| MEED | Municipal Energy and Emissions Database |