Source : WordNet®

stacks
     n 1: a large number or amount; "made lots of new friends"; "she
          amassed a mountain of newspapers" [syn: {tons}, {dozens},
           {heaps}, {lots}, {mountain}, {piles}, {scores}, {loads},
           {rafts}, {slews}, {wads}, {oodles}, {gobs}, {scads}, {lashings}]
     2: storage space consisting of an extensive arrangement of
        bookshelves in a library where most of the books are
        stored [syn: {set of bookshelves}]