Arabic ( or ) is a name applied to the descendants of the Classical Arabic language of the 6th century AD. This includes both the literary language (Modern Standard Arabic or Literary Arabic, used in most written documents as well as in formal spoken occasions, such as lectures and radio broadcasts) and the spoken Arabic varieties, spoken in a wide arc of territory stretching across the Middle East and North Africa. Arabic is a Central Semitic language, closely related to Hebrew and the Neo-Aramaic languages, and also related to the South Semitic languages (e.g., Amharic in Ethiopia, Tigrinya in Ethiopia and Eritrea, and Mehri in Yemen and Oman) and the extinct East Semitic languages (e.g., Akkadian, first attested nearly 5,000 years ago). The written language is distinct from and more conservative than all of the spoken varieties, and the two exist in a state known as diglossia, used side-by-side for different societal functions.