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/stæk/ · stack
noun
  1. A pile of objects placed one on top of another. She placed a stack of books on the desk.
  2. A tall chimney, especially of a factory or power plant. The old mill's smokestack rose above the town.
  3. In computing, a data structure that follows last‑in, first‑out (LIFO) ordering. The program uses a stack to manage function calls.
verb
  1. To arrange objects in a pile, one on top of another. Please stack those chairs in the corner.
  2. To arrange the cards in a deck in a particular manner, often to cheat. Someone is stacking the deck to ensure a win.
  3. In gambling, to take all the money another player has on the table. I stacked Jill's last $100 this hand.
Did you know? The term 'stack' for the data structure was popularized by early computer scientists in the 1940s, borrowing the physical metaphor of a pile of plates.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 17, 2026