Original: The Arapaho language or "hinono'eitiit" (also "Arapahoe Language" and "hiinonoei'tiit") is a Plains Algonquian language (an areal rather than genetic grouping) spoken almost entirely by elders in Wyoming, and to a much lesser extent in Oklahoma.
Simplified: The Arapaho language (also Arapahoe) is a Plains Algonquian language (an areal rather than genetic grouping) spoken by elders in Wyoming.