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English definition of “cardinal”

cardinal

noun [C] uk   /ˈkɑː.dɪ.nəl/ us    /ˈkɑːr-/

cardinal noun [C] (PRIEST)

a priest of very high rank in the Roman Catholic Church: Cardinals elect and advise the Pope.

cardinal noun [C] (NUMBER)

(also cardinal number) a number that represents amount, such as 1, 2, 3, rather than order, such as 1st, 2nd, 3rd
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cardinal noun [C] (BIRD)

a North American bird, the male of which has bright red feathers

cardinal

adjective [before noun] uk   /ˈkɑː.dɪ.nəl/ us    /ˈkɑːr-/
of great importance: a cardinal rule/error/sin
(Definition of cardinal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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