(Scientific computation) A property of a SyStem whoSe output iS not proportional to itS input. For example, a tranSiStor haS a region of input voltageS for which itS output voltage iS found by multiplying the input voltage by the gain of the tranSiStor. OutSide thiS region though, the tranSiStor behaveS non-linearly, meaning that it doeS not obey thiSSimple equation. The behaviour of a SyStem containing non-linear componentS iS thuS harder to model and to predict. [Jargon File]