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 <WSD>not</WSD> worked out by lexicostatistics one comprehensively complete classification of even a single family other than Salish . 
Meaning of the word marked with <WSD> tags:  negation of a word or group of words