- A flaw or fault which allows the undesired escape of something, such as a fluid or energy. Also, the location of such a flaw or fault. Also, that which escapes. May also refer to such a flaw or fault which allows the undesired entry of something.
- The flow of current through unwanted paths of a circuit, along the surface or through the body of a dielectric or insulator, or that which is otherwise undesired or lost. Also, the current which flows in this manner, or is lost.
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