| Term | Definition |
| Acute Angle | An angle with a measure less than 90 degrees. |
| Addend | Any number that is being added. |
| Analog Time | Time displayed on a timepiece having hour and minute hands. |
| Area | The measure, in square units, of the inside of a plan figure. |
| Array | A rectangular arrangement of objects in equal rows or columns. |
| Combination | A group of items. Placing these items in a different order does not create a new combination. |
| Cone | A solid figure that has a circular base and one vertex. |
| Congruent | Having same size and shape. examples - congruent angles, congruent segments |
| Cube | A rectangular solid having six congruent square faces. |
| Cylinder | A three-dimernsional figure with two circular bases, which are parallel and congruent. |
| Volume | The amount of space, in cubic units, that a solid figure can hold. |