| firs | the fielding position of the player on a baseball team who is stationed at first base |
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| firs | the lowest forward gear ratio in the gear box of a motor vehicle |
| firs | (Great Britain) an honours degree of the highest class |
| firs | the first element in a countable series |
| firs | the first or highest in an ordering or series |
| firs | the time at which something begins |
| firs | being the gear producing the lowest drive speed |
| firs | ranking above all others |
| firs | serving to begin |
| firs | serving to set in motion |
| firs | preceding all others in time or space or degree |
| firs | (music) highest in pitch or chief among parts or voices or instruments or orchestra sections |