cardinal number: Meaning and Definition of

car'dinal num'ber

1. Also calledany of the numbers that express amount, as one, two, three, etc. (distinguished from ordinal number).
2. Also calleda number or symbol analogous to the number of elements in a finite set, being identical for two sets that can be placed into one-to-one correspondence:, a, … a is n. The cardinal number of the set a