The Collaborative International Dictionary of English v.0.48:
Afforest \Af*for"est\, v. t. [LL. afforestare; ad + forestare. See Forest.] To convert into a forest; as, to afforest a tract of country. [1913 Webster]WordNet (r) 3.0 (2006):
afforest v 1: establish a forest on previously unforested land; "afforest the mountains" [syn: afforest, forest]