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Elementary Dictionary
       

cer·tain·ty

certainty

 
 
pronunciation:
suhr tn ti
part of speech: noun
inflections: certainties
definition 1: If you have certainty about something, you are completely sure about it. You have confidence in your knowledge or in your opinion about it. If you have certainty that you are going to get an A on a certain test, then you are completely sure that you will. You have no doubt.
I don't know why Alex has so much certainty that he's going to win the race tomorrrow. He'll be really upset if he loses.Mrs. Ipsen knows a lot about geography, and she can answer any question with complete certainty.
synonyms:
confidence, sureness
antonyms:
confusion
similar words:
security
definition 2: A certainty is something that people are completely sure about or that everybody can agree on.
It's a certainty that the fire was started by lightning. Nobody is doubting this.
similar words:
fact, inevitability, reality, truth