[1] : WordNet (r) 2.0

expansion slot
     n : computer a socket in a microcomputer that will accept a
         plug-in circuit board; "the pc had three slots for
         additional memory" syn: slot
see also:
slot 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

expansion slot
     
         a connector in a computer into which an expansion
        card can be plugged.  the connector supplies power to the
        card and connects it to the data bus, address bus and
        control signals of the motherboard.
     
        1998-06-26
     
     
see also:
expansion card data bus address bus motherboard 

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