early 15c., assumpten "to receive up into heaven" (especially of the Virgin Mary), also assumen "to arrogate," from Latin assumere, adsumere "to take up, take to oneself, take besides, obtain in addition," from ad- "to, up" (see ad-) + sumere "to take," from sub "under" (see sub-) + emere "to take" (see exempt (adj.)).
Meaning "to suppose, to take for granted as the basis of argument" is first recorded 1590s; that of "to take or put on (an appearance, etc.)" is from c. 1600. Related: Assumed; assuming. Early past participle was assumpt. In rhetorical usage, assume expresses what the assumer postulates, often as a confessed hypothesis; presume expresses what the presumer really believes.
例文
1. Don 't assume your baby automatically needs feeding if she 's fretful.
あなたの赤ちゃんが騒ぐと乳を飲むことだと思ってはいけません。
2.Civilians assume ，wrongly，that everything in the military runs smoothly.
庶民は軍隊の中ですべてが正常に機能していると思っているが、そうではない。
3.People assume they know me through and through the moment we meet.
人々は私を見ると、私のことをよく知っていると思っています。
4. "Today?"-"I 'd assume so，yeah."
「今日？」――「はい、そうだと思います。」
5.You cannot assume that a speaker of English is ipso facto qualified to teach English.