/ ˈsɜːtnti; NAmE ˈsɜːrtnti/ noun ( pl. -ies )
1.
[ C ] a thing that is certain :
political / moral certainties
Her return to the team now seems a certainty.
2.
[ U ] the state of being certain :
There is no certainty that the president's removal would end the civil war.
I can't say with any certainty where I'll be next week.
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WORD ORIGIN
Middle English : from Old French certainete , from certain , based on Latin certus settled, sure.