a.

1. 习惯的，惯例的
   "Good morning" is a conventional greeting.

   “早安”是习用的招呼语。

2. 普通的；常见的
3. （武器）传统式的，非核的
   conventional warfare

   常规战争

4. 符合习俗的；过分拘泥的
   I wish you weren't so conventional in the clothes you wear.

   我真希望你穿衣不要那么保守。

5. 因袭的，陈腐的
6. 公约的，协定上的；会议的

adj.

1. based on or in accordance with convention.
   ▸overly concerned with convention.
2. (of weapons or power) non-nuclear.
3. Bridge  (of a bid) intended to convey a particular meaning according to an agreed convention. Often contrasted with natural.