pseudorandom

A distribution ensemble ${\{D_n\}}_{n\in \mathbb{N}}$ is pseudorandom if it is computationally indistinguishable from the ensemble ${\{U_n\}}_{n\in \mathbb{N}}$ where each $U_n$ is the uniform distribution on the support of $D_n$. That is, no reasonable procedure can make meaningful predictions about what element will be chosen.