語言年代學 yǔyánniándàixué glottochronology Origin Definitions Defs Strokes Stroke Words Sentences Sents 语言 語言 yǔyán noun language human language or speech; a system of communication consisting of vocabulary and grammar used by a particular country or community年代学 年代學 niándàixué chronology the science of determining and arranging the dates of past events