American Heritage Dictionary
(4)
Century Dictionary
(4)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
This is the only mention of "mandatory" in conjunction with service, the only other use of the word mandatory is in regard to prohibited qualifying activities (religious ceremonies).— Alex Jones' Prison Planet.com
Tiki Island and Bayou Vista officials will decide Thursday morning whether to call a mandatory evacuation.— The Daily News - News
Since portability and speed are mandatory, the Dell laptop case is equipped with comfortable rubber over-molded top and side handles, an extendable handle, exterior mounted urethane wheels, and easy-to-open latches make it a snap to access laptops.— ThomasNet Industrial Newsroom - Today's New Product News
The decision to make the evacuation mandatory was a very tough call to make, Thomas said.— The Daily News - News
It†™ s intriguing to encounter completely non-mandatory, optional dialogue.— GameSetWatch

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