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cardinal (Adjective, Noun)
As an adjective, it describes something of greatest importance or fundamental significance. As a noun, it refers to a high-ranking official in the Catholic Church, a bright red North American bird, or a number used for counting.
Think of a CAR on a HINGE. The CAR is the most important (CARDINAL) thing, and the HINGE (Latin 'cardo') is what it turn...
He finished in cardinal place. → He finished in first place.
The cardinal rule are to be quiet. → The cardinal rule is to be quiet.
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