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'cardinal' - used as an adjective
1. serving as an essential component
a cardinal rule
2. being or denoting a numerical quantity but not order
cardinal numbers

'cardinal' - used as a noun
3. (Roman Catholic Church) one of a group of more than 100 prominent bishops in the Sacred College who advise the Pope and elect new Popes
4. the number of elements in a mathematical set; denotes a quantity but not the order
5. a variable color averaging a vivid red
6. crested thick-billed North American finch having bright red plumage in the male
See also
  • ordinal
    Who Said that ?
    A cardinal principle of Total Quality escapes too many managers: you cannot continuously improve interdependent systems and processes until you progressively perfect interdependent, interpersonal relationships. - Click here to find out.
    Fact of the day
    Astronomers once believed a planet named Vulcan existed between Mercury and the Sun.