This book offers a crosslinguistic (250 languages) and typological analysis of the number category. The nine Chapters respectively deal with: a typology of number systems with regard to number values and their distribution among nominals; number values across languages and their combination within one and the same language; which nominals are involved in the singular-plural opposition across languages; an integration of the basics of the two previous chapters; nominal expression; the syntax of number; other uses of number; verbal number and a conclusion and new challenges.