n.[C]

1. 司空见惯的事
   Jet travel is now a commonplace.

   乘喷气式飞机旅行现在是寻常的事。

2. 老生常谈；陈词滥调
3. 【古】备忘札记

a.

1. 平淡无味的；平凡的，普通的；陈腐的
   The fashionable remarks of today often become the commonplace expressions of tomorrow.

   今天流行的时髦话明天常常成为陈腐之言。

adj.

n.

1. a usual or ordinary thing.
   ▸a trite saying or topic.
2. a passage copied into a commonplace book.