In linguistics, in the field of structural dialectology, a diasystem's a single genetic language which has two or more standard forms. Some dialects are often divided into separate languages due to different historical and cultural development. Other possible differences between languages include vocabulary, such as Occitan being affected by French and Catalan by Spanish words, and writing systems, such as Hindi in Devanagari and Urdu in the Arabic script, despite being mutually intelligible. S… (More on Diasystem)