Entry 1 sense Webster, 1913 Reforestation /rēfˌ-ôr-əs-tāsh'-ən/ · Re·for·est·a·tion · IPA /rˌiːfɔrəstˈeɪʃən/ 01 n replanting with trees; reconversion into a forest; the act of reforesting. 1. replanting with trees; reconversion into a forest; the act of reforesting.