a.

1. 習慣的，慣例的
   "Good morning" is a conventional greeting.

   "早安"是習用的招呼語。

2. 普通的；常見的
3. （武器）傳統式的，非核的
   conventional warfare

   常規戰爭

4. 符合習俗的；過分拘泥的
   I wish you weren't so conventional in the clothes you wear.

   我真希望你穿衣不要那麼保守。

5. 因襲的，陳腐的
6. 公約的，協定上的；會議的

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.