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I couldn't find anything in Longman dictionary about this word, but I heard it somewhere which by now I don't remember where and when. What does it mean?

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closed as general reference by RegDwigнt Jan 11 '12 at 0:41

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

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see: en.wikipedia.org/wiki/Pinboard There are also other contexts where it is used as a technical term, see: dcache.org/manuals/Book-1.9.5/reference/rf-glossary.shtml and similar other uses. – Kris Jan 10 '12 at 12:18
    
And then there's Google Image Search – RegDwigнt Jan 11 '12 at 0:41
up vote 4 down vote accepted

It's a board made of cork or similar material to which notices can be pinned.

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brief and complete, thanks. – Alireza Hos Jan 10 '12 at 12:14
    
+1 Sounds perfect. – Kris Jan 10 '12 at 12:16
    
Is it British or American? – Alireza Hos Jan 10 '12 at 12:20
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@webdesigner: It’s used in Britain, but the earliest recorded use is in the ‘Washington Post’. There is, incidentally, another meaning. It can also be, I now discover, ‘a panel having an array of identical sockets each connected to some of a set of wires, so that inserting a conducting pin into any of the sockets makes an electrical connection between a specific pair or group of wires’ (OED). – Barrie England Jan 10 '12 at 12:24
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@speedyGonzales: I mean that even though it's used in Britain, it first appeared in the United States. No, it doesn't sound like a telephone exchange. – Barrie England Jan 10 '12 at 13:28

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