sure
Usage
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ascertain
When you ascertain the truth of something, you determine or find it out for sure.
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certain
If you are certain about something, you are sure or have no doubt about it.
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certainty
the state of being certain
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certifiable
fit to be certified as insane (and treated accordingly)
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certificate
present someone with a certificate
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certification
the act of certifying or bestowing a franchise on
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certify
provide evidence for
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uncertain
lacking or indicating lack of confidence or assurance
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