Kumeyaay (Kumiai), more precisely known asCentral Diegueño orCampo, is theNative American language spoken by theKumeyaay people of southernSan Diego andImperial counties in California.

Hinton in 1994 suggested a conservative estimate of 50 native speakers of Kumeyaay.^[2]

Kumeyaay belongs to theYuman language family and to the Delta–California branch of that family. Kumeyaay and its neighbors,ʼIipay to the north andTiipay to the south, were often considered to be dialects of a single Diegueño language, but the 1990 consensus among linguists seems to be that at least three distinct languages are present within the dialect chain.^[3]

Confusingly, Kumeyaay is commonly used as a designation both for the central language of this family and for the ʼIipay-Tiipay-Kumeyaay people as a whole. Tiipay is also commonly used as a collective designation for speakers of both Kumeyaay and Tiipay proper.

In 1999, published documentation for the Kumeyaay language appeared to be limited to a few texts.^[4] In 2019, Margaret Field (along with other translators and native speakers) published a trilingual book of stories and oral histories from Baja California Tiipay communities of Nejí and La Huerta.^[5]

Video and audio recordings of stories, conversation, and wordlists in the Tiipay variants spoken in Nejí and La Huerta have been uploaded to the Archive of the Indigenous Languages of Latin America (AILLA).^[6] Some of these have been transcribed and are available to download on the Endangered Languages Archive^[7] hosted by the Endangered Languages Documentation Program (ELDP) at the University of London.

As of April 2023, classes are available throughKumeyaay Community College paired withCuyamaca Community College as well asSan Diego State University.^[8] There is also a Kumeyaay language immersion program.^[9]

Alveolar sounds/t,s,n,r/ can also be heard as post-alveolar[t̠,s̠,n̠,r̠].^[10]

Vowel length may also be distributed.

• Carrico, Richard L. (2012-05-21)."Can language preservation battle be won?". Books.North County Times. Archived fromthe original on 2012-07-25. Retrieved2012-08-07.
• Couro, Ted; Christina Hutcheson (1973).Dictionary of Mesa Grande Diegueño; 'Iipay Aa-English/English-'Iipay Aa. Banning, CA: Malki Museum Press.LCCN 74206934.
• Couro, Ted; Margaret Langdon (1975).Let's talk 'Iipay Aa : an introduction to the Mesa Grande Diegueño language. Banning, CA: Malki Museum Press.LCCN 75332636.
• Gorbet, Larry Paul (1976).A grammar of diegueño nominals. New York: Garland Publishing.LCCN 75025116.
• Langdon, Margaret (1970).A grammar of Diegueño; the Mesa Grande dialect. Berkeley: University of California Press. Retrieved2016-09-27.
• Mai, Anna; Aguilar, Andrés; Caballero, Gabriela (2019)."Ja'a Kumiai". Illustrations of the IPA.Journal of the International Phonetic Association.49 (2):231–244.doi:10.1017/S0025100317000536, with supplementary sound recordings.

• Miller, Amy (2001).A grammar of Jamul Tiipay. Mouton grammar library. Hawthorne, NY: Mouton de Gruyter.ISBN 978-3110164510.
• Miller, Amy (2008).Barona inter-tribal dictionary: 'Iipay aa Tiipay aa Uumall. Lakeside, CA: Barona Museum Press.ISBN 9780932653925.

• ELAR archive ofDocumentation of the Baja California Yuman Languages Kumeyaay and Ko'alh

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