假设在英语中的意思是 "assume" 或 "presume"。这个词来源于拉丁文的 "supponere"，意思是 "放在旁边" 或 "对待为真实"。

例句：

I assume that you're coming to the party tonight. (我假设你今晚会来参加聚会。)

She presumed that he was the one who broke the vase. (她假设他是打破花瓶的人。)

在英语中，"假设" 还可以表示 "hypothesis"，这个词来源于希腊文的 "hypotithenai"，意思是 "放在下面" 或 "假定为真"。

例句：

My hypothesis is that the earth is flat. (我的假设是地球是平的。)

His hypothesis was proven wrong by the experiment. (他的假设在实验中被证明是错误的。)