n.

1. 结盟；联盟，同盟；联姻[C][U][（+with/between）]
   They tried to forge an alliance.

   他们试图建立同盟。

2. 结盟诸国；联姻各方[C][G]
3. 类同，相似；亲缘关系[U][C][（+between）]

n.

1. a union or association formed for mutual benefit.
   ▸a relationship based on an affinity.
   ▸the state of being joined or associated.
2. Ecology  a group of closely related plant associations.