n.

1. 表面；钱币的正面
2. 对立面
3. 【逻】换质命题

a.

1. 表面的；正面的；朝外的
2. 对应的

n.

1. the side of a coin or medal bearing the head or principal design.
2. the opposite or counterpart of a fact or truth.

adj.

1. of or denoting the obverse of a coin or medal.
2. corresponding to something as its opposite or counterpart.