| FIR | ranking above all others |
|---|---|
| FIR | serving to begin |
| FIR | serving to set in motion |
| FIR | preceding all others in time or space or degree |
| FIR | (music) highest in pitch or chief among parts or voices or instruments or orchestra sections |
| FIR | indicating the beginning unit in a series |
| FIR | before anything else |
| FIR | the initial time |
| FIR | prominently forward |
| FIR | before another in time, space, or importance |
| FIR | emergency care given before regular medical aid can be obtained |
| FIR | an amendment to the Constitution of the United States guaranteeing the right of free expression |