Hindustani (Hindi: हिंदुस्तानी, Urdu: ) is one of the predominant languages of South Asia, with federal status in India and Pakistan in its standardized forms of Hindi and Urdu. It is widely spoken and understood as a second language in Nepal, Bangladesh, and the Persian Gulf and as such is considered a lingua franca in the Indian subcontinent. It is also one of the most widely spoken languages in the world by total number of speakers. It developed in north India, principally during the Mughal Empire, when the Persian language exerted a strong influence on the Western Hindi languages of central India; this contact between the Hindu and Muslim cultures resulted in the core Indo-Aryan vocabulary of the Indian dialect of Hindi spoken in Delhi, whose earliest form is known as Old Hindi, being enriched with Persian loanwords. Rekhta, or "mixed" speech, which came to be known as Hindustani, Hindi, Hindavi, and Urdu (derived from Zabaan-i-Ordu by Mashafi meaning "language of the Horde".), also locally known as Lashkari or Lashkari Zaban in long form, was thus created. This form was elevated to the status of a literary language, and after the partition of colonial India and independence this collection of dialects became the basis for modern standard Hindi and Urdu. Although these official languages are distinct registers with regards to their formal aspects, such as modern technical vocabulary, they continue to be all but indistinguishable in their vernacular form. Formation Most of the grammar and basic vocabulary of Hindustani descends directly from the medieval Indo-Aryan language of central India, known as Śauraseni. After the tenth century, several Śauraseni dialects were elevated to literary languages, including Braj Bhasha, Awadhi and the Khari Boli of Delhi. During the reigns of the Turko-Afghan Delhi Sultanate and the Mughal Empire in India, where Persian was adopted as the official language and Delhi was established as the capital, the imperial court and concomitant immigration infused the Indo-Aryan dialect of Hindi spoken in Delhi (the earliest form is known as Old Hindi) with large numbers of Persian, Arabic, and Chagatai words from the court; this occurred as a result of cultural contact between Hindus and Muslims in Hindustan and became the fruit of a composite Ganga-Jamuni tehzeeb. The introduced words were primarily nouns and were employed for cultural, legal and political concepts. These Persian and Arabic loanwords form 25% of Urdu's vocabulary. As a form of