1 动词 “contact” 指 “联系，联络（某人）” ，以提供或获取信息。

The doctor contacted me this morning to tell me the results of my tests.

I will contact my lawyer about this document. 

2 名词 “contact” 可以指 “联系，联络”。常见搭配有：“in contact (with)” （与某人）有联系，“make contact (with)” （与某人）取得联系，“lose contact (with)” （与某人）失去联系。

Stay in contact when you go away.

After he left the city, I lost contact with him, but I'll try to make contact again if I find out his new address.

3 名词 “contact” 也可以用来表达 “熟人，关系”。

My contacts told me there's a job opening at the business.

Do you have any contacts in the food industry? I'm looking for a supplier.

4 名词 “contact” 还可以指 “（存在手机等设备上的）联系人信息”。

I'll add you as a new contact on my phone.

Look in my contacts. My brother's number is there.