American Heritage Dictionary
(5)
Century Dictionary
(7)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
For the dereliction of duty charge, Barber could have been fined up to $750 plus court costs, and up to 90 days in jail, or both.— Mount Vernon News
However, a vocal number of observers were shocked by what they saw as a dereliction of gatekeeper "duty" by Apple.— Techdirt
Community Reinvestment Act, and disciplining US Rep. Barney Frank and Sen. Chris Dodd for their dereliction of duty with regard to their obligation to provide congressional oversight.— The Reality Check
The latest was March 11, 2008, for "unprofessional conduct - dereliction of duty-abuse."

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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