Emily Dickinson Lexicon

IM-POS-SI-BIL'I-TY, n. [from impossible.]

1. That which can not be; the state of being not possible to exist. That a thing should be and not be at the same time, is an impossibility.
2. Impracticability; the state or quality of being not feasible or possible to be done. That a man by his own strength should lift a ship of the line, is to him an impossibility, as the means are inadequate to the end. [See Impossible.]