Added 9 October 2026
certainly
/ˈsɜː.tn̩.li/ adverb
In Latin: quippe Wiktionary
adverb Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about certainly at Wordnik → Where our words come from →
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Definitely or positively (`sure' is sometimes used informally for `surely').
the results are surely encouraging
Origin
From Middle English certeynly; equivalent to certain + -ly.
From Wiktionary, via Kaikki.org (CC BY-SA)