Русско-англо-русский юридический словарь

A waiting room is a room in a place such as a railway station or a clinic, where people can sit down while they wait. (Collins Dictionary)

My train set had a little building that was two rooms with a corridor between them, and one was the ticket office where you bought the tickets, and one was a waiting room where you waited for the train. (Mark Haddon. The Curious Incident of the Dog in the Night-Time)