Sahaptin, or Ichishkiin Sinwit (literally, 'this language'), is a Plateau Penutian language spoken in south-central Washington and northern Oregon. This dictionary documents the dialect of Sahaptin that is spoken by the Yakama people. "Ichishkiin Sinwit Yakama/ Yakima Sahaptin Dictionary" is the first modern published dictionary of any Sahaptin dialect. The dictionary is divided into three sections: a Sahaptin-English section; an English-Sahaptin section; and, a section listing roots used in the formation of Sahaptin words. The Sahaptin-English section contains approximately 3,500 headwords, over 4,500 example sentences, more than 100 images, and over 9,200 sound files on an accompanying disk. Copious cross-references alert readers to related words elsewhere in the Sahaptin-English section. The English-Sahaptin and roots sections serve as indices to the Sahaptin-English section. In the English-Sahaptin section, users can look up the Sahaptin equivalents of English words. In the root section, users can see words from different parts of the dictionary that share the same component of meaning. The dictionary also contains essays by noted Plateau linguist Bruce Rigsby (professor emeritus, University of Queensland) on the histories and current usage of the terms 'Sahaptin' and 'Yakima/Yakama'. Virginia Beavert, M.Ed., a member of the Yakama Nation and native speaker of Sahaptin, is a 2006 recipient of the Washington Governor's Heritage Award; 2007 Central Washington University Alumna of the Year; 2008 recipient of the Ken Hale prize of the Society for the Study of the Indigenous Languages of the Americas; and 2008 recipient of a Distinguished Service Award, University of Oregon. She has been a professor, director of the Sahaptin Language Program, and scholar-in-residence at Heritage University since 1991. Sharon Hargus is a professor of linguistics at the University of Washington.