certain Definition

  • 1known for sure; established beyond doubt
  • 2particular but not named or specified
  • 3having complete confidence in; sure

Using certain: Examples

Take a moment to familiarize yourself with how "certain" can be used in various situations through the following examples!

  • Example

    I am certain that I locked the door before leaving.

  • Example

    He has a certain charm that makes him popular.

  • Example

    She was certain of her decision to quit her job.

  • Example

    The book is about a certain man who travels the world.

certain Synonyms and Antonyms

Antonyms for certain

Phrases with certain

  • a certain amount/number

    an unspecified but definite amount or number


    You need to add a certain amount of salt to the recipe.

  • without doubt; definitely


    I know for certain that she will be there.

  • partially; to some degree


    I agree with you to a certain extent, but I still have some reservations.

Origins of certain

from Old French 'certein', from Latin 'certus', meaning 'sure, fixed'


Summary: certain in Brief

The term 'certain' [ˈsərt(ə)n] denotes knowledge that is established beyond doubt, as in 'I am certain that I locked the door before leaving.' It can also refer to something particular but not named, as in 'The book is about a certain man who travels the world.' 'Certain' extends into phrases like 'for certain,' indicating certainty without doubt, and 'to a certain extent,' implying partial agreement.

How do native speakers use this expression?