Sentence:  These differences in turn result from the fact that my Yokuts vocabularies were built up of terms selected mainly to insure unambiguity of English meaning between illiterate informants and myself , within a compact and uniform territorial area , but that Hoijer 's vocabulary is based on Swadesh 's second <WSD>glottochronological</WSD> list which aims at eliminating all items which might be culturally or geographically determined . 
Meaning of the word marked with <WSD> tags:  pertaining to the study of the evolution of languages from a common source