American Heritage Dictionary
(10)
Century Dictionary
(13)
GNU Webster's 1913
(3)
WordNet
(8)
Elsewhere on the web
With Dupe Eliminator you can use various criteria to determine what a duplicate is then quickly remove it from your library.— Softpedia - Windows - All
More difficult to duplicate is the fact that this human being must know about SEO, in order to name, build and nurture growth in these communities to the best traffic-building advantage, although most of the best ones are completely free.— RISMedia
For anyone frustrated with Excel who needs to clean, fix, de-duplicate or generally manipulate structured or unstructured data.— MacUpdate - Mac OS X
Interestingly, if they had published a shared announcement they would have given an example of what many people think of when they hear the term duplicate content - the same copy / text / content on different websites.— Search Engine Watch Blog
Now, we must stress that making a duplicate is the proper method for this as we would hate for you to accidentally overwrite your hard work in an upgrade to the theme system.— pingVision

American Heritage Dictionary (1)
Century Dictionary (2)
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You can expect to see this word about twice a week.