Noun

1. A diagram displaying data; in particular one showing the relationship between two or more quantities, measurements or indicative numbers that may or may not have a specific mathematical formula relating them to each other.
2. A diagram displaying data, in particular one showing the relationship between two or more variables; specifically, for a function $f(x\_1,\; x\_2,\; \backslash ldots,\; x\_n)$, the set of all tuples $(x\_1,\; x\_2,\; \backslash ldots,\; x\_n,\; f(x\_1,\; x\_2,\; \backslash ldots,\; x\_n))$.
3. An ordered pair $(V,E)$, where $V$ is a set of elements called vertices (or nodes) and $E$ is a set of pairs of elements of $V$, called edges; informally, a set of vertices together with a set edges that join these vertices.

Verb

1. To draw a graph.
2. To draw a graph of a function.