Longman Dictionary of Contemporary English homepage

certainty

noun
     
cer‧tain‧ty plural certainties
1 [uncountable] the state of being completely certain
with certainty
She knew with absolute certainty that he'd say no.
The result is impossible to predict with any degree of certainty.
2 [uncountable] the fact that something is certain to happen
certainty of (doing) something
the certainty of being caught
certainty that
There's no certainty that he'll remember.
3 [countable] something that is definitely true or that will definitely happen:
He usually does quite well, but it's not a certainty.
The only certainty is that there will need to be major changes.

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