WordReference Random House Learner's Dictionary of American English © 2014
ˈcar•di•nal ˈnum•ber, n. [countable]
any of the numbers that express amount, as one, two, three.

Collins Concise English Dictionary © HarperCollins Publishers::

cardinal number, cardinal numeral n
  1. a number denoting quantity but not order in a set
    Sometimes shortened to: cardinal

Compare ordinal number

'cardinal number' also found in these entries:
In the English description:

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