Added 9 October 2026 stacks noun Categories: Describing WordsThingsUncommon Words noun ! Definition from WordNet 3.1, Princeton University. More about stacks at Wordnik → Where our words come from → A large number or amount. made lots of new friends Storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored. Related Words: pilesheapsdozenstonsoodlesloadslashingslotsgobsraftsscadsscores Back to today's word