re-

re- ► PREFIX 1) once more; afresh; anew: reactivate. 2) with return to a previous state: restore. 3) (also red-) in return; mutually: resemble. 4) in opposition: repel. 5) behind or after: relic. 6) in a withdrawn state: reticent. 7) back and away; down: recede. 8) with frequentative or intensive force: resound. 9) with negative force: recant.

ORIGIN Latin re-, 'again, back' .