A Priori Pale Ale is a 6.4% American pale ale made with a mixture of West Coast style hops, including Columbus, Cascade, and Centennial. We kept the grain bill simple, with Caramel malt for a balance of sweetness and Cara-pils for head retention. From the Internet Encyclopedia for Philosophy: The terms "a priori" and "a posteriori" are used primarily to denote the foundations upon which a proposition is known. A given proposition is knowable a priori if it can be known independent of any experience other than the experience of learning the language in which the proposition is expressed, whereas a proposition that is knowable a posteriori is known on the basis of experience.