1) Ergodicity 2) Haphazardness 1) Haphazardness 2) Irregularity 3) Noise 4) Randomness 5) Unregularity 
stochasticity The quality of lacking any predictable order or plan.
Demographical or genetic stochasity is where there is variation in the population structure or frequencies of alleles and genotypes in a population over time.