im·pos·si·bil·i·ty 
/ɪmˌpɑ:səˈbɪləti/ noun
plural im·pos·si·bil·i·ties /ɪmˌpɑ:səˈbɪləti/ noun 1 [count] : something that is impossible : something that cannot be done or that cannot happen
▪ The blizzard made travel an impossibility. ▪ a logical/mathematical impossibility 2 [noncount] : the quality or state of being impossible
▪ the impossibility of knowing what the future will bring
▪ The blizzard made travel an impossibility. ▪ a logical/mathematical impossibility
▪ the impossibility of knowing what the future will bring
