wieder-

Etymology
Adverb used as particle in verb compounds.

Prefix
A productive prefix somewhat similar to re-, indicating that:
 * 1) Something happens again, a state, fact exists anew
 * wiederkäuen, wiederwählen
 * 1) Something is restored after a certain period of interruption
 * wiederaufbauen, wiederaufnehmen, wiedereinführen, wiedereröffnen, wiederherstellen
 * 1) Something that someone had, is put back or returned
 * wiederfinden, wiedergeben, wiederkommen
 * 1) An action is reciprocated or rewarded with the same or a similar action
 * wiedergrüßen, wiederhauen, wiederlieben