American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
(3)
WordNet
(2)
Elsewhere on the web
Tobias Wolff, widely known as a prolific short-story writer and the author of the memoir— About.com Contemporary Literature
Cinematical lists seven filmmakers who are so prolific, they're like one-man movie factories.— Phillyist
Elusive and prolific, the artist-inventor owns a pop-culture profile that both lures and detracts.— Christian Science Monitor | Top Stories
Patients with temporal lobe alterations could be prolific, although the quality of their output was typically low.— Psychology Today

American Heritage Dictionary (1)
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 about twice a week.
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