The number of elements in a mathematical set; SYN. cardinal.
In mathematics, one of the series of numbers 0, 1, 2, 3, 4, ... . Cardinal numbers relate to quantity, whereas ordinal numbers (first, second, third, fourth, ... .) relate to order.
A number that indicates how many items there are in a set—for example. Compare ordinal number.
1. A number (as 1, 5, 15) that is used in simple counting and that indicates how many elements there are in an assemblage — see number table
2. The property that a mathematical set has in common with all sets that can be put in one-to-one correspondence with it