| MTBOI | | Make The Best Of It |
| mtcw | | my two cents worth |
| MTD | | Month To Date |
| mte | | mate |
| mte | | Mortgage Tax Exempt |
| mte | | My Thoughts Exactly |
| mtfbwy | | may the force be with you |
| MTMTE | | More Than Meets the Eyes |
| MTOW | | My Type Of Woman |
| mts | | Microsoft Terminal Server |
| mtsf | | mean time to system failure |
| mtsf | | Medium-Term Strategic |
| mttr | | matter |
| mttr | | Mean Time To Repair |
| MTV | | Music Television channel |
| mtwcs | | More Than Words Can Say |
| mtyci | | more than you can imagine |
| MTYK | | More Than You Know |
| MTYWEK | | more then you will ever know |
| MU | | miss you |
| MU | | mutual understanding |
| MU2m | | miss you too much |
| MUAC | | mid upper arm circumference |
| MUBAR | | Messed up Beyond All Recognition |
| MUD | | Multiple user dimension |
| MUF | | Material Unaccounted For |
| MUF | | muff |
| MUFA | | mono-unsaturated fatty acids |
| MUG | | Multi User Game |
| MUNG | | Mash Until No Good |
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