a.

1. 一致的，協調的
   They seem to have no coherent plan for saving the company.

   他們似乎沒有一個協調一致的挽救公司的計畫。

2. （話語等）條理清楚的，連貫的
   a coherent argument

   前後一致的論點

3. 有黏性的；黏合在一起的
4. 【物】相干的，相參的

adj.

1. (of an argument or theory) logical and consistent.
   ▸able to speak clearly and logically.
2. holding together to form a whole.
3. Physics  (of waves) having a constant phase relationship.