1 to accept or believe that sth is true even though you have no proof; to expect sth to be true 假设；假定；以为: I assume that you have the necessary documents. 我想你已经有必备的文件。Everyone assumed Ralph was guilty. 人人都假定拉尔夫有罪。Everyone assumed Ralph to be guilty. 人人都假定拉尔夫有罪。

2 to pretend to have or be sb/sth 假装；佯作: to assume a false name 使用假名

3 to begin to use power or to have a powerful position 开始行使权力或担任要职；承当（要职）: to assume control of sth 得到某物的控制权