[count] 1 : something that gives protection by separating things : a protective barrier
▪ Thick walls serve as a buffer from/against the sounds of the city. — often used figuratively ▪ She had to act as a buffer between the two brothers, who wouldn't stop arguing. ▪ It's important to save money as a buffer against times of illness or the loss of your job. — see also buffer state, buffer zone 2 computers : a place in the memory of a computer where information is stored for a short time 3 chiefly Brit : either one of two devices with metal springs that are connected to the front and back of railroad cars in order to reduce shock when the train hits things