|(5,500 cited 1990 census)|
Area where Isinai is spoken
Isinai (also spelled Isinay) is a Northern Luzon language primarily spoken in Nueva Vizcaya province in the northern Philippines. By linguistic classification, it is more divergent from other South-Central Cordilleran languages, such as Kalinga, Itneg or Ifugao and Kankanaey.
Isinai contains a definite article with three different forms that vary depending on the relation of the noun. The forms of the definite article are: ar, ardari, and war. 
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