| 1 | Middle English | reles | scent, taste, aftertaste |
| 2 | Old French | relais | — |
| 3 | Old French | reles | something remaining, that which is left behind |
| 4 | Old French | relaisser | Alternative form of relaschier; to leave behind |
| 5 | Latin | relaxāre | — |
| 6 | Latin | rĕ- | — |
| 7 | Latin | prōdūcō | — |
| 8 | Latin | prō- | — |
| 9 | Proto-Italic | *pro- | — |
| 10 | Proto-Indo-European | pro- | toward, forward |
| 11 | Proto-Indo-European | por- | to give birth; forward, through; going, passage |
| 12 | Proto-Indo-European | per- | before, in front; first; to go through |
| 13 | Proto-Indo-European | pr̥tós | passed , crossed |