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certainly

[sur-tn-lee] /ˈsɜr tn li/
adverb
1.
with certainty; without doubt; assuredly:
I'll certainly be there.
2.
yes, of course:
Certainly, take the keys.
3.
surely; to be sure:
He certainly is successful.
Origin of certainly
1250-1300
1250-1300; Middle English; see certain, -ly
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for certainly

certainly

/ˈsɜːtənlɪ/
adverb
1.
with certainty; without doubt: he certainly rides very well
sentence substitute
2.
by all means; definitely: used in answer to questions
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 certainly
adv.

c.1300, in all main modern senses, from certain + -ly (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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