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cer·tain·ty

certainty

 
 
pronunciation:
suhr tn ti
part of speech: noun
inflections: certainties
definition 1: the state of being sure or confident.
I've been in the house all day, and I can say with certainty that no one has called.
synonyms:
confidence, sureness
antonyms:
confusion, doubt
similar words:
assurance, self-confidence
definition 2: a fact that cannot be argued with.
It is a certainty that she will win the prize.
similar words:
fact, inevitability, reality, truth