What is Leakage-flux?

Leakage-flux definition and meaning on Dictionary terms:

an act of leaking; leak.
something that leaks in or out.
the amount that leaks in or out.
Commerce. an allowance for loss by leaking.
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).