English Reference
adverb

certainly

adv.
US /ˈsɝtənɫi/ UK /sˈɜːtənli/ cer·tain·ly

  1. 01 A2 Elementary

    used to emphasize that something is definitely true or will happen.

    used to indicate that the speaker has no doubt about the truth of a statement. Often functions as a sentential adverb to modify the entire proposition.

    Simple

    The weather is certainly getting colder now that it is November.

    In context

    The recent data certainly suggests that the economic recovery is more fragile than the initial reports had indicated.

    possiblydoubtfully
  2. 02 A2 Elementary

    used as a polite and strong way of saying 'yes' when someone asks you something.

    used as an emphatic affirmative response to a request or question, functioning as a discourse marker of agreement.

    Simple

    "Could you help me with this bag?" "Certainly, I would be happy to."

    In context

    When asked if the department would support the new initiative, the director replied, "Certainly, provided the budget remains within the agreed limits."

Usage certainly affect · certainly exist · certainly require


From Middle English certeynly; equivalent to certain + -ly.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Middle English certeynly
Level A2 · Elementary
Frequency Very common
Updated