If you are in possession of something, you have it, because you have obtained it or because it belongs to you.
双语例句
例： Those documents are now in the possession of the Washington Post.
那些文件现在归《华盛顿邮报》所有。
例： He was also charged with illegal possession of firearms.
他还被指控非法持有枪支。
例： There is no legal remedy for her to gain possession of the house.
没有合法的手段可以让她得到这所房子。