Аннотация:This chapter describes the expression of number in West Circassian, a polysynthetic language of the Northwest Caucasian family. In West Circassian, nouns contrast between non-specified efficient forms undefined for number, unmarked forms which usually–but not always–express the singular meaning, and forms which explicitly mark plurality (either by a simple plural affix or by accumulative case-number suffix). Notably, the plural morphology attaches both to count nouns and to mass nouns, sometimes triggering various semantic shifts. The con-texts where a form without a plural marker may have plural denotation include not only nominals with non-specific reference but also possessives and non-locutor definite pronominal phrases. Number can also be expressed by a dedicated associative plural suffix (whose use is however severely restricted) and by indexing outside the noun whose use has a predominantly semantic basis. The language further displays some minor constructions, such as the honorific use of indexing, a dyadic construction based on reciprocal morphology, and a pattern close to inclusory constructions.