1. A pile of similar items placed one on top of another
   "A stack of books sat on the desk"
    
2. [informal] (often followed by ‘of’) a large number, amount or extent
   "a stack of letters";
   - batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle [archaic], mountain, muckle, passel [US], peck, pile [informal], plenty, pot, quite a little, raft, sight, slew, spate, tidy sum, wad, bunch [informal], scad [N. Amer, informal]
    
3. A tall chimney for venting smoke or exhaust gases, especially at a factory or on a ship
   "The old factory's stack dominated the skyline";
   - smokestack
    
4. (computing) a last-in-first-out (LIFO) data structure that stores items in order of addition, where items can only be added or removed from the top
   "The program uses a stack to keep track of function calls"
    
5. (computing) a complete set of software components, tools, or technologies needed to create a functioning system or platform
   "The company's AI stack includes both training and inference components"

1. Arrange in stacks
   "stack your books up on the shelves";
   - pile, heap
    
2. Load or cover with stacks
   "stack a truck with boxes"
    
3. Arrange unfairly so as to increase the chances of a particular outcome
   "stack the deck of cards"; "They stacked the committee with their supporters"

Derived forms: stacks, stacking, stacked

See also: pile up, salt away

Type of: agglomerate, arrange, chimney, cumulation, cumulus, heap, lade [archaic], laden, large indefinite amount, large indefinite quantity, load, load up, memory device, mound, pile, set up, storage device

Encyclopedia: Stack, Richard