expansion slot

noun Computers.
a connection in a computer, especially a microcomputer, to which a new board can be added to expand the computer's capabilities.

Origin:
1980–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
expansion slot
 
n
a physical electronic interface provided in a computer system to enable extra facilities to be added easily at a later date

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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FOLDOC
Computing Dictionary

expansion slot definition

hardware
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)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The relay board plugs into the expansion slot of the microcomputer and has eight independent relays.
The card usually plugs into a computer's expansion slot.
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