leakage

noun

1. an act of leaking; leak.
2. something that leaks in or out.
3. the amount that leaks in or out.
4. Commerce. an allowance for loss by leaking.
5. Physics, Electricity. the loss of all or part of a useful agent, as of the electric current that flows through an insulator (leakage current) or of the magnetic flux that passes outside useful flux circuits (leakage flux).

noun

1. the act or an instance of leaking
2. something that escapes or enters by a leak
3. commerce an allowance made for partial loss (of stock, etc) due to leaking
4. physics
   1. an undesired flow of electric current, neutrons, etc
   2. (as modifier)leakage current

n.late 15c., from leak (v.) + -age.