Describing a sequence of numbers generated by a deterministic computer that is seemingly random, but eventually repeats. Good pseudo-random number generators have very long periods before the sequence repeats.
The date Easter falls on is pseudo-random in that it cannot be predicted off the top of someone's head, and it takes 5.7 million years for the sequence to repeat.

To generate a pseudo-random number in C, you'd use the Rand(); function.
by Braveheart's thirst for blood March 26, 2007

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