tick: n. 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. This sort 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 is handwaved. 3. In the FORTH language, a single
quote character.
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