Wasaṭiyyah is often given different meanings, contextualized and equated with concepts such as “appeasement,” “mediocrity,” “compromise,” and “weakness.” It is necessary, therefore, to provide clarification and an accurate review of the meaning and definition of wasaṭiyyah, as well as some of its allied expressions, which is what this chapter has attempted to do. The chapter proceeds to review the Arabic usages of the wasaṭiyyah in the Qur’an, hadith, and linguistic usage of the Arabs while drawing attention also to the renewed importance moderation acquired in the aftermath of the September 2001 attacks, their devastation effects on Islam-West relations, and a fresh cycle of radicalization, extremism, and violence the world has experienced ever since.