American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Police had a heavy police presence inside Times Square -- both uniformed and undercover, according to Commissioner Ray Kelly.— Google News - Top Stories
Thus I went undercover, after visiting a Halloween store to buy a belled collar, velvet cat ears and a nice piece of tail (30 inches, if you think length matters).— Hartford Advocate: News

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You can expect to see this word about once a week.
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