Breaking with the tradition established several Wednesdays ago, we will not adhere strictly to the OED definition for the word we want to consider today.  We could not, even if we wanted to, because according to OED it does not yet exist.  A close cousin does, and it is worth noting that possibilism (which neither MS Word’s spell-checker, nor WordPress’s, recognize as legitimate) has a meaning somewhat close to what we want to highlight.  The second sense of that word, anyhow, does:

2. Geogr. The belief that human freedom of action is not limited by the natural world.

A possibilian may be a person who does not let the natural world get in the way of doing things.  But it is actually much more interesting than that.  When you have twenty minutes set aside for some intrigue and inspiration, take a look at this for a fuller understanding of the word (from the smith who coined it):