definitely

[def-uh-nit-lee]
adverb
1.
in a clear and definite manner; unambiguously.
2.
unequivocally; positively.
interjection
3.
(used to express complete agreement or strong affirmation): Are you starting your diet tomorrow? Definitely!

Origin:
1575–85; definite + -ly


1. See clearly. 2. absolutely, certainly.
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World English Dictionary
definitely (ˈdɛfɪnɪtlɪ)
 
adv
1.  in a definite manner
2.  (sentence modifier) certainly: he said he was coming, definitely
 
sentence substitute
3.  unquestionably: used to confirm an assumption by a questioner

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

definitely
1580s, from definite (q.v.). As a colloquial emphatic word, attested by 1931.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He had the gestures and voice of a man who is definitely in the right.
Something's definitely wrong with this.
I've replayed the moment a thousand times in my head; it was definitely a
  lesson learned.
More advanced designs are definitely possible.
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