| Acronym | Meaning |
 | MK | Air Mauritius (IATA Code) - Macedonia (ISO 3166 Digram; FIPS 10-4 Country Code) -Mandalskameratene (Norwegian Football Club) -Megakelvin -Missionary Kid - Mortal Kombat (game) |
| MM | Millimetre |
| N/K/A | Now Known As |
| IANA | Internet Assigned Numbers Authority |
| MS | Megasecond |
| OTO | Ordo Templi Orientis (Latin |
| CEA | Campaign Effectiveness Analysis |
| YU | York University -former Yugoslavia (ISO 3166 Digram |
| ASTIA | Armed Services Technical Information Agency |
| LTP | Long-Term Potentiation |
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