Words / B1

SURTN/ˈsɜːtn/

Certain means sure, with no real doubt. I am certain (that) this is right; a certain amount can also mean some, not specified. Sure is more informal; definite is about a decision that will not change. Make certain = check. Certainty is the noun. A certain person / a certain Mr Khan is a written way to say “someone I am not naming.”

Meaning

Sure; without doubt.

Examples

• “I am certain this is the right address.”
• “Are you certain you locked the door?”
• “We need a certain amount of quiet to study.”

Good to know

certain (that) + clause. make certain = check. Informal: sure. Noun: certainty.

Near in meaning

sure, definite

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