from The American Heritage® Dictionary of the English Language, 4th Edition
- Again; anew: rebuild.
- Backward; back: react.
- Used as an intensive: refine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- again, anew
from the GNU version of the Collaborative International Dictionary of English
- A prefix signifying back, against, again, anew. Combinations containing the prefix re- are readily formed, and are for the most part of obvious signification.
Middle English, from Old French, from Latin; see re- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old French re- in some cases, directly from Latin re- in others. Displaced native English ed-, eft-, gain-, with-/wither-. (Wiktionary)