American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
Although I love some of these ideas, I think that none of them will get enough groundswell or uptake to make an impact on our testing and our email marketing efforts.— The Email Wars
Mark_Wolf Sounds like a Sonny Weems groundswell is building.— RockyMountainNews.com
New Likudniks are being minted each day as the groundswell for Netanyahu grows.

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You can expect to see this word several times a year.
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