1One by one, in sequence — doing things in turn without skipping the order. Often used as 順々に〜する ("to do ~ one after another").
受付で名前を呼ばれた人から順々に中に入ってください。
Please enter one by one, starting with whoever's name is called at the reception desk.
先生は生徒たちに順々に質問していった。
The teacher asked the students questions one after another, in turn.
荷物を順々に運べば、そんなに疲れないよ。
If you carry the luggage one piece at a time, it won't tire you out so much.
順々に並んでお待ちください。
Please line up and wait in order.