The word you are asking about is spelled “certain.”

Correct spelling

  • Standard English spelling: certain.
  • Part of speech: commonly an adjective, sometimes a pronoun.

Meaning and usage

  • As an adjective: “I am certain she will come,” meaning sure or confident.
  • It can also mean “particular but not named,” as in “a certain person called you.”

Pronunciation help

  • UK pronunciation: /ˈsɜː.tən/.
  • US pronunciation: /ˈsɝː.tən/.

Example sentence: “I’m certain this is the right spelling.”

If you were thinking of a different word that sounds similar (like “curtain” or “certainly”), say so and that can be clarified too.