a.

1. 商定的，一致的，协同的
   All governments should make a concerted effort to stop the drug trade.

   各国政府应协调一致努力阻止毒品交易。

2. 【音】分声部的

adj.

1. jointly arranged or carried out.
   ▸done with great effort.
2. (of music) arranged in several parts of equal importance.