Source : Webster's Revised Unabridged Dictionary (1913)

Leakage \Leak"age\, n. [Cf. D. lekkage, for sense 1.]
   1. A leaking; also, the quantity that enters or issues by
      leaking.

   2. (Com.) An allowance of a certain rate per cent for the
      leaking of casks, or waste of liquors by leaking.

Leakage \Leak"age\, n. (Elec.)
   A leak; also; the quantity of electricity thus wasted.

Source : WordNet®

leakage
     n : the unwanted discharge of a fluid from some container; "they
         tried to stop the escape of gas from the damaged pipe";
         "he had to clean up the leak" [syn: {escape}, {leak}, {outflow}]