A number used to denote quantity; a counting number; a cardinal. / (mathematics) A generalized kind of number used to denote the size of a set, including infinite sets.

A freshwater fish (Paracheirodon axelrodi, family Characidae), native to rivers in South America, popular as an aquarium fish.

(medicine) The primary or major symptom by which a diagnosis is made / (homeopathy) The particular symptom which is regarded most important for choosing the curing substance

A cardinal of the Roman Catholic Church who is bishop of one of the cardinal ("hinge") dioceses of the Province of Rome. / (more loosely) A cardinal who is a bishop anywhere.

a cardinal number used as an adjective

(Christianity) The four virtues of prudence, justice, fortitude, and temperance.

A bright-red-colored beetle, Pyrochroa serraticornis. / A related species, Pyrochroa coccinea / A more distantly related species, Schizotus pectinicornis

Any of the deadly sins.

A large European spider, Tegenaria parietina.

plural of cardinal numeral