Read the dictionary definition of cardinal. All definitions for this word.
1. crested thick-billed North American finch having bright red plumage in the male
2. a variable color averaging a vivid red
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. serving as an essential component
1. a cardinal rule
2. the central cause of the problem
3. an example that was fundamental to the argument
4. computers are fundamental to modern industrial structure
6. being or denoting a numerical quantity but not order
1. cardinal numbers
