A room (as in a hotel or airport) with seating where people can wait(noun)
WordNet. Princeton University. 2010.
Use "waiting area" in a sentence
"On the following Sunday, 10th September, the Graf Spee and Altmark arrived at the northern limit of the waiting area chosen by Langsdorff as being free of British ships, and at noon slowed down so that they just had steerage way."
"Everything about Collier, Rose is smooth and cultured, from the coolly beautiful receptionist to the elegant cream-and-white waiting area with the silver tea service."
"He knew that she'd had to pass through a metal detector even to get into the waiting area of the city jail, so there was no weapon in the purse she tossed on the floor of the Boxster's passenger side."