Definition:Partition (Probability Theory)

Definition
Let $\left({\Omega, \Sigma, \Pr}\right)$ be a probability space.

A partition of $\Omega$ is a family $\left\{{B_i: i \in I}\right\}$ of disjoint events such that $\displaystyle \bigcup_i B_i = \Omega$.

Also see

 * Definition:Partition (Set Theory): the usage of partition here is the same as this.

However, even though it means the same thing, it is helpful to define it separately, as here, in the more specialised context of probability theory.