Book excerpt: As the seventh volume of a multi-volume set on the Chinese language, this book studies the Mongolian influence on neologisms in Modern Chinese and innovations in word formation and lexical meanings during the period. Focusing on lexicons in Modern Chinese, the Chinese language used since the 13th century CE, this book first introduces new monosyllables and the entry of spoken idioms and dialects into the written language as well as the mingling of the Chinese language with the Mongolian and Manchu languages. It then focuses on the development and features of polysyllabic words in Modern Chinese, covering alliterative and rhyming compounds and trisyllabic and four-syllable words. The final chapter discusses the change of lexical meaning systems in Modern Chinese based on an analysis of monosyllables, disyllables and polysyllables. Illustrated with abundant examples, this comprehensive groundwork on Chinese lexical history will be a must read for scholars and students studying the modern Chinese language and linguistics and especially for beginning learners of the modern Chinese lexicon.