1. A factORy test designed to catch systems with marginal components befORe they get out the doOR the theORy is that burn-in will protect customers by outwaiting the steepest part of the bathtub curve (see infant mORtality). 2. A period of indeterminate length in which a person using a computer is so intensely involved in his project that he fORgets basic needs such as food, drink, sleep, etc. Warning: Excessive burn-in can lead to burn-out. See hack mode, larval stage. [Jargon File]