cardinality

[ kahr-dn-al-i-tee ]
/ ˌkɑr dnˈæl ɪ ti /

noun, plural car·di·nal·i·ties. Mathematics.

(of a set) the cardinal number indicating the number of elements in the set.

Origin of cardinality

First recorded in 1930–35; cardinal + -ity

British Dictionary definitions for cardinality

cardinality
/ (ˌkɑːdɪˈnælɪtɪ) /

noun

maths the property of possessing a cardinal number
maths logic (of a class) the cardinal number associated with the given class. Two classes have the same cardinality if they can be put in one-to-one correspondence