a.

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

   演讲者强调了建立一个政党来领导该国的根本重要性。

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

   东、西、南、北是罗盘上的四个方位基点。

3. 深红的，鲜红的
   She is wearing a cardinal sweater today.

   今天她穿了件鲜红的毛衣。

4. 红衣主教的

n.

1. （罗马天主教的）红衣主教，枢机主教[C]
2. 深红色，鲜红色[U]
3. 【数】基数[C]
4. 红衣凤头鸟，北美红雀[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.