at the same time; simultaneously; all at once — an adverb indicating events occurring together or at once.
観客が一時に拍手を送った。
The audience all applauded at once.
注文が一時に集中して、対応が追いつかなかった。
Orders came in all at once and we couldn't keep up.
子供たちは一時に遊び始めた。
The children all started playing at the same time.