1An adverb meaning that something will happen soon or shortly — very close in meaning to "right away," and commonly heard in station and train announcements.
間もなく電車がまいります。ご注意ください。
The train will arrive shortly. Please be careful.
間もなく上映が始まりますので、お席についてください。
The screening will begin shortly, so please take your seats.
会議は間もなく終了する予定です。
The meeting is scheduled to end shortly.
彼女は間もなく退院できると医者に言われた。
The doctor told her she'd be able to leave the hospital soon.
2Used directly after a verb's dictionary form in the pattern "with no time to (do something)" — meaning something else happened before there was time to act.
朝食を食べる間もなく家を出た。
He left the house without even having time to eat breakfast.
考える間もなく、とっさに答えてしまった。
I answered on the spot, with no time to think it over.
座る間もなく、次の会議に呼ばれた。
I was called to the next meeting before I even had time to sit down.