Definition of cardinal noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. A cardinal is a bright red songbird, and the word also refers to the bird's crimson color. In Catholicism, a cardinal is a high-ranking bishop. In math, you use cardinal numbers to count. A cardinal rule is one that is central and should not be broken. CARDINAL meaning : 1. a priest of very high rank in the Roman Catholic Church: 2. a number that represents amount…. Learn more. The sight of a cardinal , with its vibrant red feathers and striking presence, has long been associated with various spiritual and symbolic meanings . Whether spotted perched in a tree, fluttering by your window, or seen during a peaceful walk through nature, the appearance of a cardinal often carries significant symbolism. But what exactly does it mean when you see a cardinal ? This article delves into the rich history, symbolism, and interpretations of this beautiful bird, exploring its ...