volens: a forfeit of the right to sue if one willingly chooses to engage in a dangerous activity that leads to injury relative to that danger.

Sagacity of such exemplary brevity gives us reason not merely to defend, but to celebrate, latin maxims in legal education today . ~ Plutarch

Now Plutarch we do want to be clear. Before we celebrate let's admit that the term was not a "latin" maxim as you imply. The word was imbued with this meaning from a narrower latin base by legal educators who needed a brief term that had class and weight. Me? I think the derived and contrived meaning is great! But I bet you can't say it without puffing out your chest.