| Abbreviation | Definition |
|---|---|
| MOD | Middle Of Day |
| MON | Monday |
| Mon. | Monday |
| MTWRF | Monday, Tuesday, Wednesday, Thursday, Friday |
| MTWRFSS | Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday |
| MW&F | Monday Wednesday and Friday |
| MWF | Monday Wednesday Friday |
| NAD | National Aboriginal Day (Canada, June 21st) |
| NAD | National Aborigines Day |
| NAD | National Aborigines’ Day |
| NAID | National Aboriginal and Islander Day |
| NASD | National Alcohol Screening Day |
| NATSIW | National Aboriginal and Torres Strait Islander Week |
| NBD | National Baseball Day |
| ND | Next Day |
| NDSD | National Depression Screening Day |
| NDSW | National Dark Sky Week |
| NDW | National Dance Week |
| NEDAW | National Eating Disorders Awareness Week |
| NEED | National Energy Education Day |