| Abbreviation | Definition |
|---|---|
| MQC | Mailpiece Quality Control Certified Specialist |
| MQCCS | Mailpiece Quality Control Certified Specialist |
| MQP | Myob Qualified Professional |
| MR | Medical Representative |
| MR | Mister |
| MR | Motorola Representative |
| MR | Mr. Right |
| MRA | Minimum Retirement Age |
| MRCC | Missouri Registered City Clerk |
| MRICS | Member of the Royal Institution of Chartered Surveyors |
| MRM | Managing Risk Manager |
| MRM | Medical Risk Manager |
| MRSL | Middle Range Salary Level |
| MS | Mad Scientist |
| MS | Mean Salary |
| MSAA | Marketable Skills Achievement Award |
| MSAA | Medicare Supplement Accredited Advisor |
| MSAHM | Married Stay-At-Home Mom |
| MSC | Medicaid Service Coordinator |
| MSE | Most Significant Ex |