cardinality

English Thesaurus

1. (mathematics) the number of elements in a set or group (considered as a property of that grouping) (noun.quantity)

hypernym	:	number,
definition	:	a concept of quantity involving zero and units (noun.quantity)

domain category	:	math, mathematics, maths,
definition	:	a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement (noun.cognition)