Definition of Vitally

Babylon English Dictionary
critically, urgently, essentially; vigorously, animatedly, spiritedly
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Vitally Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(adv.)
In a vital manner.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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vitally
\vi"tal*ly\, adv. in a vital manner.
vitally
adv : to a vital degree; "this is vitally important

Concise English-Irish Dictionary v. 1.1
thar a bheith
WordNet 2.0

Adverb
1. to a vital degree; "this is vitally important"
(pertainym) vital, life-sustaining