soon; shortly; in a little while
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。席についてください。
The screening will start soon. Please take your seats.
会議は間もなく終了します。
The meeting will finish shortly.
used after a verb in dictionary form to mean 'with no time to (do something)' or 'before one could (do something)'
朝食を食べる間もなく家を出た。
He left the house without having time to eat breakfast.
考える間もなく答えを言ってしまった。
I answered before I had time to think.