a.

1. 重要的，主要的
   The speaker emphasized the cardinal importance of building a party to lead the country.

   演講者強調了建立一個政黨來領導該國的根本重要性。

2. 基本的，根本的
   North, south, east, and west are the four cardinal points of the compass.

   東、西、南、北是羅盤上的四個方位基點。

3. 深紅的，鮮紅的
   She is wearing a cardinal sweater today.

   今天她穿了件鮮紅的毛衣。

4. 紅衣主教的

n.

1. （羅馬天主教的）紅衣主教，樞機主教[C]
2. 深紅色，鮮紅色[U]
3. 【數】基數[C]
4. 紅衣鳳頭鳥，北美紅雀[C]

n.

1. a leading dignitary of the Roman Catholic Church, nominated by and having the power to elect the Pope.
2. a deep scarlet colour like that of a cardinal's cassock.
3. an American songbird of which the male is partly or mostly red and which typically has a crest. [Cardinalis cardinalis and other species, subfamily Cardinalinae.]

adj.