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definitely

[def-uh-nit-lee] /ˈdɛf ə nɪt li/
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 of definitely
1575-1585
1575-85; definite + -ly
Synonyms
1. See clearly. 2. absolutely, certainly.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for definitely

definitely

/ˈdɛfɪnɪtlɪ/
adverb
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for definitely
adv.

1580s, from definite + -ly (2). As a colloquial emphatic word, attested by 1931.

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for definitely

17
18
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