Here are some possibilities:
* Aforest could be a misspelling of "afore", which means "before" or "previously."
* Aforest could be a misspelling of "afforest", which means to plant trees in a previously treeless area.
* Aforest could be a misspelling of "forest", which is a large area of land covered with trees.
If you can provide more context about where you encountered this word, I might be able to give you a more accurate answer.