Usage: usually capitalized
1.
a. : an ancient Subaraean people with an Indo-Iranian ruling class having a kingdom in northern Mesopotamia that was dominant in Mesopotamia and northern Syria from the end of the 15th to the middle of the 14th century B.C.
b. : a member of these people
2. : the language of the Mitanni people that was of uncertain relationship
Useful english dictionary. 2012.