[kahr-dn-al-i-tee] 
| (of a set) the cardinal number indicating the number of elements in the set. |
cardinality mathematics
The number of elements in a set. If two sets have the same number of elements (i.e. there is a bijection between them) then they have the same cardinality. A cardinality is thus an isomorphism class in the category of sets.
aleph 0 is defined as the cardinality of the first infinite ordinal, omega (the number of natural numbers).
(1995-03-29)
dnˈæl