def·i·nite·ly

[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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
definitely (ˈdɛfɪnɪtlɪ) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Definitely is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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
Then, when it had been established that the mango was definitely ripe, near
  insanity set in.
There are definitely people working in this area however.
They're definitely a cut above their clumsy predecessors.
For the serious photographer, f-stops and shutter speeds were definitely not
  instinctive.
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