n.[U]

1. 了解；理解；领会；认识
   I doubt whether he had any real understanding of Shakespeare.

   我怀疑他是否真正理解莎士比亚的作品。

2. 理解力；判断力
   The problem is beyond my understanding.

   这个问题我无法理解。

3. 谅解；协议；共议[S1][（+with）][+that]
   We came to an understanding after the argument.

   经过争辩以后，我们达成了谅解。

4. 同情心，同感；融洽[S1]
   She showed great love and understanding.

   她表现出极大的爱和同情。

a.

1. 了解的；有理解力的；聪明的
   an understanding smile

   会心的微笑

2. 能谅解的，宽容的
   My friend is a very understanding person.

   我的朋友是一个非常通情达理的人。

n.

1. the ability to understand something; comprehension.
   ▸the power of abstract thought; intellect.
   ▸an individual's perception or judgement of a situation.
2. sympathetic awareness or tolerance.
3. an informal or unspoken agreement or arrangement.

adj.

1. sympathetically aware of other people's feelings; tolerant and forgiving.
2. archaic having insight or good judgement.