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]