Arab people, also known as Arabs (Arabic: عرب, ʿarab), are a panethnicity primarily living in the Arab world, which is located in Western Asia and North Africa. They are identified as such on one or more of genealogical, linguistic, or cultural grounds, with tribal affiliations, and intra-tribal relationships playing an important part of Arab identity. The word "Arab" has had several different, but overlapping, meanings over the centuries (and sometimes even today). In addition to including all Arabized people of the world (with language tending to be the acid test), it has also at times been used exclusively for bedouin (Arab nomads [although a related word, "`a-RAB," with the Arabic letter "alif" in the second syllable, once was sometimes used when this specific meaning was intended] and their now almost entirely settled descendants). It is sometimes used that way colloquially even today in some places. Townspeople once were sometimes called "sons of the Arabs." As in the case of other ethnicities or nations, people identify themselves (or are identified by others) as "Arabs" to varying degrees. This may not be one's primary identity (it tends to compete with country, religion, sect, etc.), and whether it is emphasized may depend upon one's audience. If the diverse Arab pan-ethnicity is regarded as a single ethnic group, then it constitutes one of the world's largest after Han Chinese.