| ACRONYM | FULL WORDING | COMMENT |
| MDO | Marine Diesel Oil | Oil fuel used in TYPEs of moderate power (auxiliaries, etc...) Rarely a petroleum distillate and generally a mixture of GO + HVF |
| MINMAX | Minimum / Maximum | The exact quantity of cargo that vessel undertakes to load and that Charterers undertake to ship |
| MOA | Memorandum of agreement | Sale contract of a vessel |
| MOL | More or Less | Relates to a margin at the option of either party |
| MOLOO | More or less at Owners’ option | Relates to a margin at the option of the Owners, f.i. +/- 5% on the quantity of cargo |
| MS | Motor Ship | |
| MT | Metric Ton | |
| MT, M/T | Motor Tanker | |
| MV, M/V | Motor Vessel | |
