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1. [informal] A large number or amount
   "she amassed stacks of newspapers";
   - tons [informal], dozens, heaps [informal], lots, piles [informal], scores, loads [informal], rafts [informal], slews, wads [informal], oodles [informal], gobs [N. Amer, informal], scads [N. Amer, informal], lashings [Brit, informal], many, masses [Brit, informal]
    
2. Storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored

1. An orderly pile
    
2. (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], mint, mountain, muckle, passel [US], peck, pile [informal], plenty, pot, quite a little, raft, sight, slew, spate, tidy sum, wad, bunch [informal]
    
3. A large tall chimney through which combustion gases and smoke can be evacuated
   - smokestack
    
4. A storage device that handles data so that the next item to be retrieved is the item most recently stored (LIFO)
   - push-down storage, push-down store
    
5. A list in which the next item to be removed is the item most recently stored (LIFO)
   - push-down list, push-down stack

1. Load or cover with stacks
   "stack a truck with boxes"
    
2. Arrange in stacks
   "stack your books up on the shelves";
   - pile, heap
    
3. Arrange the order of so as to increase one's winning chances
   "stack the deck of cards"

See also: heap up, stack away

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

Part of: depository library, library

Encyclopedia: Stacks