Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “certain”

certain

adjective (KNOWING TO BE TRUE)   /ˈsɜr·tən/
knowing that something is true or will happen and having no cause to feel that it may not be true or may not happen ; having no doubt : "I think Emily is going to pick up Judy ." "Are you certain?" One thing is certain – supporters of the bill are not giving up. [+ (that) clause] I’m certain (that) he’ll be there. [+ question word] I’m not certain how much it will cost . When you report a robbery , make certain a police report is filled out (= check that this happens ).
(Definition of certain adjective (KNOWING TO BE TRUE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of certain

Browse related topics

You are looking at an entry to do with Certainty, but you might be interested in these topics from the Chance and possibility topic area:

Definitions of “certain” in other dictionaries

Word of the Day

gastronomy

the art and knowledge involved in preparing and eating good food

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More