Sentence:  Mary Sarah Nelson, 93, is not the last of her tribe – there are four dozen left – but the last speaker of its language. The federal attempt to grant tax credits to Native American parents whose children prove fluent in <WSD>Native languages</WSD> has failed. When she switches from English to Eyak, there is a sadness to her that neither language can express. 
Meaning of the word marked with <WSD> tags:  The language of a Native or Aboriginal people (often capitalized).