certainty

[1]	fact , actuality , reality , truth , (Colloq) sure thing
[2]	assurance , sure thing , foregone conclusion , self-assurance , definiteness , confidence , conviction , faith , authoritativeness , positiveness , certitude
[3]	for a certainty , assuredly , definitely , certainly , surely , positively , undoubtedly , indubitably , without (a) doubt , undeniably , unquestionably , absolutely , (Colloq) for sure