1 [count] a : a part of the inside of a building that is divided from other areas by walls and a door and that has its own floor and ceiling
▪ Cigarette smoke filled the room. ▪ I could hear the TV from the next room. ▪ The salesman went into the back room [=a room in the back of a building] to get another pair of shoes for me to try.
b : a room in a house, hotel, etc., where someone sleeps
▪ a double room [=a room in a hotel where two people can sleep] ▪ Go to your room! ▪ He rents rooms to college students. — see also bedroom, guest room 2 [noncount] : space that is used for something
▪ We're running out of room in the office. ▪ The sofa takes up too much room. ▪ In the backyard there is enough room to run and play. ▪ Is there enough room to turn the car around? ▪ There's only room for five people in the car. ▪ Don't eat too much. You should leave some room for dessert. ▪ There's no more room on the computer disk to save the file. ▪ Can we make/find room in the garage for the bicycles? — see also elbow room, headroom, legroom, standing room 3 [singular] : the people in a room
▪ The whole room cheered/applauded. 4 [noncount] : the possibility for something to happen or exist — often + for ▪ There is room for improvement in your essay. [=your essay is not as good as it could be] ▪ There is no room for doubt about his guilt. [=his guilt is certain] 5 rooms [plural] Brit, old-fashioned : apartment
▪ I visited his rooms in London.