knowledge about a subject, situation, etc. or about how something works

She doesn't have any understanding of politics/human nature/what it takes to be a good manager. 她对政治／人性／如何成为一个好经理一无所知。

My understanding of the agreement (= what I think it means) is that they will pay $50,000 over two years. 我对协议的理解是他们会在两年内支付5万美元。

a positive relationship between two people or groups in which they feel sympathy for each other

For peace to exist in the region there needs to be a much improved understanding between all the parties concerned. 为了地区和平，需要有关各方大力增进彼此的谅解。

an informal agreement between people

It took several hours of discussion before they could come to/reach an understanding. 他们讨论了几个小时才达成协议。

If you do something on the understanding that something else can or will happen, you do it because someone else has promised that it can or will.

We bought the sofa on the understanding that we could return it if it didn't fit in the room. 我们买下这个沙发，前提是不合适可以退货。

An understanding person who has the ability to know how other people are feeling, and can forgive them if they do something wrong.

He had expected her to be horrified, but she was actually very understanding. 他本以为她会惊慌失措，但她实际上非常通情达理。