The discharge of a fluid from some container

In computer science, a memory leak is a type of resource leak that occurs when a computer program incorrectly manages memory allocations in a way that memory which is no longer needed is not released.

An accidental hole that allows something (fluid or light etc.) to enter or escape

In electronics, leakage is the gradual transfer of electrical energy across a boundary normally viewed as insulating, such as the spontaneous discharge of a charged capacitor, magnetic coupling of a transformer with other components, or flow of current across a transistor in the "off" state or a reverse-polarized diode.

The presence of an unwanted signal via an accidental coupling

In statistics and machine learning, leakage is the use of information in the model training process which would not be expected to be available at prediction time, causing the predictive scores to overestimate the model's utility when run in a production environment.

Spill is the occurrence in sound recording and live sound mixing whereby sound is picked up by a microphone from a source other than that which is intended.

In economics, a leakage is a diversion of funds from some iterative process.

Retail leakage occurs when local people spend a larger amount of money on goods than local businesses report in sales, usually due to people traveling to a neighboring town to buy goods.

In chemistry, leakage is a process in which material is gradually lost, intentionally or accidentally, through the holes or defects of their containers.