n.

1. 纠纷；混乱；复杂（化）[U][C]
   We cannot allow further complication of this matter.

   我们不能让这件事变得更复杂了。

2. 【医】并发症[C]
   Incorrectly triaged patients could sustain further injury and complications.

   检伤分类不正确的患者可能蒙受伤势恶化及并发症。

3. （新出现的）困难，障碍[C]
   Both parents work, which adds complications to their family life.

   父母都工作，这给他们的家庭生活增添了困难。

4. （戏剧、小说情节发展中出现的错综复杂的）纠葛

n.

1. a circumstance that complicates something; a difficulty.
   ▸a confused or complex state.
2. Medicine  a secondary disease or condition aggravating an already existing one.