Definitions for vastly
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Princeton's WordNet
vastly, immensely(adverb)
to an exceedingly great extent or degree
"He had vastly overestimated his resources"; "was immensely more important to the project as a scientist than as an administrator"
Wiktionary
vastly(Adverb)
Greatly, in a vast manner.
Webster Dictionary
Vastly(adverb)
to a vast extent or degree; very greatly; immensely
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"vastly." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/vastly>.