(computer) a socket in a microcomputer that will accept a plug-in circuit board; slot
the PC had three slots for additional memory
Microsoft Computer Dictionary
n. A socket in a computer, designed to hold expansion boards and connect them to the system bus (data pathway). Expansion slots are a means of adding or enhancing the computer’s features and capabilities. In laptop and other portable computers, expansion slots come in the form of PCMCIA slots designed to accept PC Cards. See also expansion board, PC Card, PCMCIA slot.
