Sentence:  He has announced results on Hokan , Penutian , Uto-Aztecan , and almost all other American families and phyla , and has diagrammed their degree of interrelation ; but he has not worked out by lexicostatistics one comprehensively complete classification of even a <WSD>single</WSD> family other than Salish . 
Meaning of the word marked with <WSD> tags:  being or characteristic of a single thing or person