be abandoned in recognition of the emerging socio-political vocabulary; the Bodo means the plain tribes of western and northern Assam known earlier as the Bodo-Kacharis of the Brahmaputra Valley. Kachari The term Kachari has been used through much of history to denote the same people who came to be termed as Bodo. One of the earliest usage can be found in the 16th century Assamese language Bhagavata. In Buranjis and colonial documents Boro–Garo speakers who were from the plains were collectively called Kachari. Endle's 1911 ethnographic work, The Kacharis, explain that there were plains Kacharis and hills Kacharis and a host of other ethnic groups that fall under the Kachari umbrella. Eventually the appellation kachari was retained only by those groups that have been fully integrated into Assamese society, such as Sarania Kachari, Sonowal Kachari, whereas others who were formerly called Kacharis have assumed ethnonyms, such as Boro or Dimasa. Kachari is pronounced as Kachhāri or Kossāri. The origin of the name is most likely a self-designation korosa aris that is found in a very old Boro song: Pra Ari, Korasa Ari Jong pari lari lari (We are Korosa Aris, first-born sea race Our line is continuous) Origins Today the peoples included in the Bodo-Kacharis speak either one of the languages from the Boro–Garo branch of Tibeto-Burman or an Indo-Aryan language such as Assamese or Bengali. It is generally believed that when the first Tibeto-Burman speakers entered the Brahmaputra valley, it was already populated by people speaking Austroasiatic and probably other language."(T)he valley was not deserted when the first (known) speakers of Tibeto-Burman languages arrived; they encountered people who spoke Mon-Khmer languages, of which the Khasi languages are the remnants. Bodo-Kachari community traditions as well as scholars agree that they came from the north or the east; and current phylogenetic studies suggest that the Boro–Garo language descended from Proto-Tibeto-Burman in Northern China near the Yellow River. Linguists suggest that the initial ingress took place 3000 years before present or earlier, and that the immigrant proto-Boro–Garo speakers were not as numerous as the natives. Linguists find the Boro–Garo languages remarkable in two aspects—they have a highly creolised grammar, and they extend over a vast region that radiates out into Nepal and Tripura from the Brahmaputra valley. Emergence of creolised Boro–Garo as lingua franca , giving the examples of Nagamese, Jingpho, and Garo today, has suggested that they are in different stages