certain

/ˈsɜːrtən/
adjective
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Definition

1

Having no doubt or uncertainty; confident

I'm certain that I locked the door before leaving the house.

2

Known or established to be true; definite

It's certain that the new policy will affect our company's profits.

Synonyms

sureMore informal, often used in everyday conversations confidentEmphasizes a feeling of self-assurance, often about one's abilities definiteMore formal, often used in written or official contexts

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