Webster's English Dictionary

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certainty

cer.tain.ty \-te-\ n 1: something that is certain  2: the quality or state 
   of being certain mean a state of being free from doubt. CERTAINTY and 
   CERTITUDE are very close, but CERTAINTY may stress the existence of 
   objective unquestionable proofs, CERTITUDE may emphasize a faith strong 
   enough to resist all attack; ASSURANCE implies confidence rather than 
   intellectual certainty; CONVICTION applies esp. to belief strongly held by 
   an individual and usu. concerned with moral or spiritual rather than 
   factual matters SYN syn CERTAINTY, CERTITUDE, ASSURANCE, CONVICTION