certain

adjective
UK: /ˈsɜːtn/
US: /ˈsɜːrtn/

  1. Completely sure or having no doubt about something.

    1. I am certain I locked the door when I left this morning. [ ] [ ]
    2. She felt certain that they would succeed if they followed this plan. [ ] [ ]

  2. Used to refer to a particular thing or person without naming them or giving any more details.

    1. A certain person told me you were planning a surprise party. [ ] [ ]
    2. Certain types of cheese are stronger in flavor than others are. [ ] [ ]

  3. Known for sure; established beyond doubt.

    1. It is now certain that the painting is a genuine Rembrandt. [ ] [ ]
    2. After years of research, it's certain that smoking causes lung cancer. [ ] [ ]

Synonyms

sure positive definite assured unquestionable undoubted inevitable some
certain adverb

  1. For sure.

    1. They will certain win the game. [ ] [ ]
    2. She will certain appreciate the gesture of goodwill shown by her colleagues. [ ] [ ]

Frequently Asked Questions

The word "certain" in English means: Completely sure or having no doubt about something., Used to refer to a particular thing or person without naming them or giving any more details., Known for sure; established beyond doubt..

The phonetic transcription of "certain" is /ˈsɜːtn/ in British English and /ˈsɜːrtn/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "certain": sure, positive, definite, assured, unquestionable, undoubted, inevitable, some.

Example usage of "certain": "I am certain I locked the door when I left this morning.". More examples on the page.