Definition:Event

Definition
Let $\EE$ be an experiment.

An event in $\EE$ is an element of the event space $\Sigma$ of $\EE$.

Also defined as
Some sources define an event as a subset of the sample space $\Omega$.

However, while this is technically consistent with the definition as given here, it misses the nuance that it is an element of a specified set of such subsets of $\Omega$ that comprise the event space.