Kamarupi Prakrit is the postulated Middle Indo-Aryan (MIA) Prakrit language used in ancient Kamarupa. This language has been derived from Gauda-Kamarupi Prakrit and the historical ancestor of the Kamatapuri lects and the modern Assamese language; and can be dated prior to 1250 CE, when the proto-Kamta language, the parent of the Kamatapuri lects, began to develop. Though not substantially proven, the existence of the language that predated the Kamatapuri lects and modern Assamese is widely believed to be descended from it.
Like other inscriptions of Kamarupa kingdom which were written in Sanskrit, the Nidhanpur inscription of Bhaskar Varman shows "mistakes" and have few Apabhramsa terms due to influence of a local Apabhramsa.
Prakrit is a group of vernacular Middle Indo-Aryan languages that were used in the Indian subcontinent from around the 3rd century BCE to the 8th century CE. The term Prakrit is usually applied to the middle period of Middle Indo-Aryan languages, excluding earlier inscriptions and Pali.
Word for "Prakrit" (here Prā-kṛ-te) in Late Brahmi script in the Mandsaur stone inscription of Yashodharman-Vishnuvardhana, 532 CE
The Sūryaprajñaptisūtra, an astronomical work written in Jain Prakrit language (in Devanagari book script), c. 1500
