Definition of "most certainly" []

• Superlative form of certainly: most certainly. (adverb)
• Used to indicate emphatic agreement. (interjection)

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• "The adventurers and evangelists became a familiar cast of favorites, their names coupled like music hall double acts: Burton and Speke, who argued in public about who discovered what; Sam and Florence Baker, who most certainly did not; Henry Stanley, the American self-publicist, and David Livingstone, his Scottish straight man."
• "President George W. Bush is most certainly a Matcher, as evidenced by his faith in daily routine and his approach to Iraqi evasions on disarmament."
• "Likewise, once those nerves are damaged they cannot be regrown—and most certainly not in an adult."