| 1 | English | reduce | To bring down the size, quantity, quality, value... |
| 2 | Old French | reducer | — |
| 3 | Latin | reduco | I lead, draw, bring or conduct back; bring or... |
| 4 | English | re- | again, anew; a completive or intensification of... |
| 5 | Middle English | re- | — |
| 6 | Old French | re- | re- |
| 7 | Latin | rĕ- | — |
| 8 | Latin | prōdūcō | — |
| 9 | Latin | prō- | — |
| 10 | Proto-Italic | *pro- | — |
| 11 | Proto-Indo-European | pro- | toward, forward |
| 12 | Proto-Indo-European | por- | to give birth; forward, through; going, passage |
| 13 | Proto-Indo-European | per- | before, in front; first; to go through |
| 14 | Proto-Indo-European | pr̥tós | passed , crossed |