cardinal

A primary or essential rule that should not be broken.

A number denoting quantity (one, two, three, etc.), as opposed to an ordinal number (first, second, third, etc.).

In Christian tradition, one of the seven deadly sins; by extension, a very serious offense.

A fundamental belief or tenet that is considered to be of central importance.

Of the greatest importance; fundamental.

In Christian tradition, one of the four principal virtues (justice, prudence, temperance, and fortitude).

One of the four main points of the compass (north, south, east, and west).

A high-ranking archbishop who is also a cardinal in the Catholic Church.