1(of a number of things) put or arranged in a stack or stacks:the stacked chairs (of a place or surface) filled or covered with goods:the stacked shelves (of a machine) having sections that are arranged vertically:full-sized washer-dryers are replacing stacked units (of a heel) made from thin layers of wood, plastic, or another material glued one on top of the other. 2(of a deck of cards) shuffled or arranged dishonestly so as to gain an unfair advantage. 3 informal (of a woman) having large breasts. 4 Computing (of a task) placed in a queue for subsequent processing. (of a stream of data) stored in such a way that the most recently stored item is the first to be retrieved.