 The terminology is most clearly associated with Bertrand Russell, but the distinction between knowledge by acquaintance and knowledge by description is arguably a critical component of classical or traditional versions of foundationalism. Let us say that one has inferential or nonfoundational knowledge that p when one’s knowledge that p depends on one’s knowledge of some other proposition(s) from which one can legitimately infer p; and one has foundational or noninferential knowledge that p when one’s knowledge that p does not depend on any other knowledge one has in this way. According to foundationalism regarding knowledge, we have some foundational knowledge, and any nonfoundational or inferential knowledge that we have depends, ultimately, on this foundational knowledge. What distinguishes classical foundationalism (or at least a prominent version of classical foundationalism) about knowledge is the insistence that all foundational knowledge is knowledge by acquaintance. 