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certainly

[ sur-tn-lee ]
/ ˈsɜr tn li /
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adverb
with certainty; without doubt; assuredly: I'll certainly be there.
yes, of course: Certainly, take the keys.
to be sure; surely: He certainly is successful.
QUIZ
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Origin of certainly

Middle English word dating back to 1250–1300; see origin at certain, -ly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use certainly in a sentence

British Dictionary definitions for certainly

certainly
/ (ˈsɜːtənlɪ) /

adverb
with certainty; without doubthe certainly rides very well
sentence substitute
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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