saturate

Let $G(V,E)$ be a graph and $M$ a matching in $G$. A vertex $v\in V(G)$ is said to be saturated by $M$ if there is an edge in $M$ incident to $v$. A vertex $v\in V(G)$ with no such edge is said to be unsaturated by $M$. We also say that $M$ saturates $v$.