I'd define free will as used by the average person to mean the ability to make decisions that are based at least in part on something other than your makeup and environment.
Or so says a paper. Assuming no methodological errors and replication, in which Psychology (this being posted in "Philosophical Psychology" is a very bad culprit, and stats/polls even more so).
Let's be fair, it's more than one paper. That's just the latest in a whole series of papers empirically testing lay people's intuitions on this question (see the citations).
