range

Let $R$ be a binary relation. Then the set of all $y$ such that $xRy$ for some $x$ is called the range of $R$. That is, the range of $R$ is the set of all second coordinates in the ordered pairs of $R$.

In of functions, this means that the range of a function is the full set of values it can take on (the outputs), given the full set of parameters (the inputs). Note that the range is a subset of the codomain.