A prefix is a letter or series of letters that cannot stand on its own, but which creates a new word when added in front of some word.
Here is a list of common prefixes with their meanings:
| a | opposite | amoral (immoral) |
| co | with | coexister (to coexist) |
| contre | against | contre-attaquer (counterattack) |
| de | from | décharger (to discharge) |
| in | in or un(as a negative) | inégal (unequal) |
| pré | before | préavis (forewarning) |
| trans | trans, through, across | transatlantique (transatlantic) |
| bi | twice | bipède (two-footed) |
| inter | between | intervenir (to intervene) |
| post | after | post-scriptum (postscript) |
| pré | in advance | prédire (to forecast) |
| re | again | revoir (to see again) |
| semi | half | semi-nomade (seminomad) |
| anti | against | anticommuniste (anticommunist) |
| peri | around | périscope (periscope) |
See Also: