cer·tain·ty 
/ˈsɚtn̩ti/ noun
plural cer·tain·ties /ˈsɚtn̩ti/ noun 1 [noncount] : the state of being or feeling certain about something
▪ Scientists still do not know with any degree of certainty why the disease spread so quickly. ▪ We cannot predict the outcome with absolute/any certainty. ▪ There was no certainty that the package would arrive in time. ▪ Her certainty about these complex moral issues is surprising. ▪ It is difficult to say with certainty [=in a certain or definite way] which of the plays was written first. 2 [count] : something that is certain : a fact about which there is no doubt
▪ We live in a world without certainties. [=a world in which things are not certain] ▪ His victory in the election is almost a certainty. [=it is nearly certain/definite that he will win the election]
▪ Scientists still do not know with any degree of certainty why the disease spread so quickly. ▪ We cannot predict the outcome with absolute/any certainty. ▪ There was no certainty that the package would arrive in time. ▪ Her certainty about these complex moral issues is surprising. ▪ It is difficult to say with certainty [=in a certain or definite way] which of the plays was written first.
▪ We live in a world without certainties. [=a world in which things are not certain] ▪ His victory in the election is almost a certainty. [=it is nearly certain/definite that he will win the election]
