名詞 cardinal:

1. (Roman Catholic Church) one of a group of more than 100 prominent bishops in the Sacred College who advise the Pope and elect new Popes
2. the number of elements in a mathematical set; denotes a quantity but not the order
   同義詞：cardinal number
3. a variable color averaging a vivid red
   同義詞：carmine
4. crested thick-billed North American finch having bright red plumage in the male
   同義詞：cardinal grosbeak, Richmondena Cardinalis, Cardinalis cardinalis, redbird

形容詞 cardinal:

1. serving as an essential component
   同義詞：central, fundamental, key, primal
2. being or denoting a numerical quantity but not order

1. The cardinal number equal to2?0.
   二十等于2乘10的基數(shù)
2. The cardinal number equal to1015.
   十的十五次冪基數(shù)等于1015
3. The cardinal number equal to109.
   十億基數(shù)，等于109
4. The cardinal idea of the Labor Party's political thought is that all people should be equal.
   工黨政治思想的要點(diǎn)是人人平等。

car.di.nal

adj.（形容詞）
Of foremost importance; paramount:
基本的：最重要的；首要的：
例句：
a cardinal rule; cardinal sins.
基本準(zhǔn)則；七大罪

Color Dark to deep or vivid red.
【色彩】 大紅的：顏色深至深紅或鮮紅的
n.（名詞）
Abbr. Card.Roman Catholic Church A high church official, ranking just below the pope, who has been appointed by a pope to membership in the College of Cardinals.
縮寫(xiě) Card.【羅馬天主教】 紅衣主教：一種高級(jí)宗教官員，級(jí)別僅低于教皇，由教皇任命為紅衣主教團(tuán)的成員
Color A dark to deep or vivid red.
【色彩】 大紅：顏色深至深紅或鮮紅
A North American finch(Cardinalis cardinalis) having a crested head, a short, thick bill, and bright red plumage in the male.
主紅雀：一種北美鳴鳥(niǎo)（主紅雀 主紅雀屬） ，頭部有羽冠，喙短而厚，雄鳥(niǎo)的羽毛色澤亮紅
A short, hooded cloak, originally of scarlet cloth, worn by women in the 8th century.
女式斗篷：一種8世紀(jì)時(shí)，婦女披的帶風(fēng)帽的短斗篷，最初用猩紅色的布料做成
A cardinal number.
基數(shù)

來(lái)源：
Middle English
中古英語(yǔ)
from Late Latin cardin3lis [principal, pivotal]
源自 后期拉丁語(yǔ) cardin3lis [主要的，最重要的]
from Latin [serving as a hinge]
源自 拉丁語(yǔ) [起鉸鏈作用的]
from cardô cardin- [hinge]
源自 cardô cardin- [鉸鏈]

【引伸】
car.dinalship.
n.（名詞）