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expansion slot (plural expansion slots)

  1. (computing) A slot for additional hardware, cards, etc. for the purpose of expanding a computer system.
    • 1984, Practical Computing (volume 7, page 93)
      Fitting any of the joysticks to a Spectrum proved tedious. For starters I tried the Spectrum ZX Interface 2, a 5in-by-3in. chunk of plastic containing a single chip. It fits into the Spectrum expansion slot in a way that tempts wobble.