Definitions

1. noun

A high-ranking bishop in the Catholic Church, ranking above an archbishop.

“The cardinal is the spiritual leader of our diocese.”

2. noun

A red bird, especially the northern cardinal, a common bird in North America.

“The cardinal perched on the windowsill, singing a sweet melody.”

3. adjective

Chief or most important in rank, influence, or value.

“The cardinal principle of the company is customer satisfaction.”

4. noun

In mathematics, a cardinal is a measure of the size of a set, such as the number of elements in a set.

“The cardinality of the set is equal to the number of elements it contains.”