• (n.) The act or process of converting again into a forest.
Re`af·for`es·ta'tion (-ĕs*tā'shŭn) noun The act or process of converting again into a forest. 
reforestation, reafforestation 1. The restoration (replanting) of a forest that has been reduced by fire or by cutting. 2. To convert again into the forest; such as, a region or a section of a country.