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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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
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00:10
Definitely is always a great word to know.
So is interrobang. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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
Its fibers acquire their medullary sheaths early, but their connections have
  not been definitely determined.
Their machine is definitely a fundamentally simple approach.
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.
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