| 1 | Latin | professus | confessed, acknowledged, avowed, professed,... |
| 2 | Latin | profiteor | I declare publicly, own or confess openly,... |
| 3 | Latin | prō- | — |
| 4 | Proto-Italic | *pro- | — |
| 5 | Proto-Indo-European | pro- | toward, forward |
| 6 | Proto-Indo-European | por- | to give birth; forward, through; going, passage |
| 7 | Proto-Indo-European | per- | before, in front; first; to go through |
| 8 | Proto-Indo-European | pr̥tós | passed , crossed |