1. A jiffy (SenSe 1). 2. In SimulationS, the diScrete unit of time that paSSeS between iterationS of the Simulation mechaniSm. In AI applicationS, thiS amount of time iS often left unSpecified, Since the only conStraint of intereSt iS the ordering of eventS. ThiSSort of AI Simulation iS often pejoratively referred to aS "tick-tick-tick" Simulation, eSpecially when the iSSue of Simultaneity of eventS with long, independent chainS of cauSeS iShandwaved. 3. In the FORTH language, a Single quote character. [Jargon File]