in order; one after another; in turn — used to indicate doing things sequentially.
順々にお入りください。
Please enter one at a time.
質問には順々に答えてください。
Please answer the questions one by one.
仕事を順々に片付けていけば、今日中に終わるはずだ。
If you handle the tasks one at a time, you should finish them today.
お客様は受付で順々に呼ばれます。
Customers are called in order at reception.