| asymptote | A line that a graph of a function will come close to, but not cross or even touch. |
| domain | The set of all possible input values for the variable in a function. |
| domain of a function | The set of all input values or x-coordinates of the function. |
| function | A relation that assigns to each x-value exactly one y-value. |
| function notation | An equation that takes the form f(x) =, and is read “f of x is…” For example, f(x) = 3x + 7. |
| line of reflection | The line that cuts a parabola into two halves (which are mirror images of each other). |
| parabola | A u-shaped graph which is produced by a quadratic function. |
| range | The set of all possible outputs in a function. Also the difference between the greatest value of a data set and the least value. |
| range of a function | The set of all output values or y-coordinates of the function. |
| relation | A correspondence between sets of values or information. |
| vertex | A turning point in a graph. Also the endpoint of the two rays that form an angle. |