會(huì)議被推遲到明天早上10點(diǎn)開(kāi)始.
至于你的補(bǔ)充,回答如下：先來(lái)看下牛津高階詞典中對(duì)Delay的釋義：
delay
v
[I,In/pr,Tn] (cause sb to) be slow or late 使（某人）慢或遲到; 耽擱; 延誤:Don't delay!Book your holiday today!別拖延!今天就定下你休假的日子!* She delayed (for) two hours and missed the train.她耽擱兩個(gè)小時(shí),把火車(chē)誤了.* I was delayed by the traffic.因交通阻塞,我遲到了.
[Tn,Tg] put (sth) off until later; postpone 推遲（某事）; 延期:We must delay our journey until the weather improves.我們必須把旅行推遲,等天氣好轉(zhuǎn)再說(shuō).* Why have they delayed opening the school?他們?yōu)槭颤N延期開(kāi)學(xué)?
你所提問(wèn)的句子中delay是被動(dòng)態(tài),所以就是及物動(dòng)詞,因此釋義可參照以上第二條.
再者,如果會(huì)議是一直開(kāi)到明早十點(diǎn)的話,那這個(gè)句子就不應(yīng)該用delay,而是應(yīng)該用last,表示持續(xù)動(dòng)作：The meeting will be lasted till ten o'clock tomorrow morning.