American Heritage Dictionary
(3)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
Both performers are marvelous, and DiCaprio's outing is among the best of his career.— RGJ.com - Latest News
She is marvelous, and I can fully understand why M Veber is so enamored.— GreenCine Daily
The music by Mr. Frankel in the charming first half is marvelous, the music in the just plain stupid second half is not so marvelous.— BroadwayWorld.com Featured Content
To him the marvelous was the beautiful, the mysterious was the sublime.— Pharyngula
The intent was marvelous, and someone, sometime has to start to get serious about the state of our climate.— Halifax Live

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