| Acronym | Definition |
|---|
| FDOS➣First Day of Service |
| FDOS➣First Day of School |
| FDOS➣First Day of Summer |
| FDOS➣Flooder Denial of Service |
| FDOS➣Floppy Disk Operating System |
| FDOS➣Florida Department of State |
| FDOS➣First Day of Spring (Rita's promotion) |
| FDOS➣From Date of Service (various states) |
| FDOS➣Finest Depth of Sort (US Postal Service) |
| FDOS➣Fixed Disk Operating System |