| Term | Definition |
| Inductive | reasoning based upon patterns you observe |
| Deductive | the process of reasoning logically from given statements to a conclusion |
| Conjecture | a conclusion you reach using inductive reasoning |
| Counterexample | an example where the conjecture is false |
| Point | a location, it has no size, it is represented by a dot, it is named with a captial letter |
| Space | the set of all points |
| Line | a series of points that extends in two opposite directions without end |
| Collinear | points that lie on the same line |
| Plane | a flat surface with no thickness |
| Coplanar | points and lines in the same plane |
| Postulate | an accepted statement of fact |