An Arab (Arabic: عربي) is someone who identifies as Arab on geneaological, political, and/or linguistic grounds (i.e. those who trace their ancestral origins back to the Semitic tribes of the Arabian Peninsula). Narrow to broad, and sometimes overlapping, multiple definitions of who is an Arab have been offered. (See below)
The Arabic language spread throughout the Middle East and North Africa with the advent of Islam in the 7th century. The conquests of successive Arab Islamic empires resulted in the Arabization and cultural assimilation of the region's other indigenous Semitic and non-Semitic peoples of non-Arab origin, often together with their Islamization. With time, the label Arab expanded beyond a pure geneaological definition to come to be associated with Arabized populations of countries in North Africa and the Middle East. Many individuals and groups in this region, such as the Egyptians (both Muslims and Copts) and the Amazighs, reject classification as Arab based on these socio-cultural or linguistic definitions. Islamized, but non-Arabized peoples form part of the Muslim World, and not the traditionally secular Arab World.