Language barriers are obviously an impediment to communication. If one man speaks Chinese and another Swedish, it may be hard for them to settle even simple matters, let alone the deep issues of the day. Yet there can be language barriers even within a language, such as when people use ill-defined terminology. In fact, some debates rage on endlessly partially because people who have the same tongue are, sometimes unknowingly, speaking a different language. This occurs to me when I hear many arguments about Left versus Right. For example, it’s not uncommon for conservatives and liberals to debate whether groups...