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}]
expansion slotA 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)