Certainly - Synonyms, Antonyms and Etymology | EWA Dictionary
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Certainly

/ˈsɜːtnli/
Certainly is used to express assurance, confidence or affirmation in a statement or idea.

Synonyms:

Antonyms:

Examples:

I will certainly call you later.This is certainly my favorite book.

Etymology:

etymology
Originates from the Old French certain from Latin certanus, a late variant of certus, meaning sure, settled, or determined.

Usage Statistics:

139 mentions per 1 million words Frequency
Very Often
bulb Hint: Frequency according to COCA
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