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English definition of “expansion card”

expansion card

noun [C]
 
 
IT
a board covered with small metal electrical connections that create one or more circuits and that can be connected to the main circuit board of a computer so that it can do more things: Installing a wireless (or any other) network usually means opening your desktop PC to plug in an expansion card. →  See also USB
(Definition of expansion card from the Cambridge Business English Dictionary © Cambridge University Press)
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