| A | B |
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| Aligned Dimension | A system of dimensioning which requires all numerals, figures, and notes to be aligned with the dimension lines so that they may be read from the bottom and from the right side. |
| Allowance | The tightest possible fit between two mating parts. |
| Auxiliary View | A view that is used to show features that are located on an inclined surface in true size and shape. |
| Baseline Dimensioning | System of dimensioning in which all dimensions are placed from a datum and not from feature to feature. |
| Bilateral Tolerance | A tolerance in which variation is permitted in both directions from the specified dimension. |
| Chain Dimensioning | Also known as point-to-point dimensioning where dimensions are established from one point to the next. |
| Clearance Fit | Limits the size of mating parts so that a clearance always results when mating parts are assembled. |
| Cutting Plane Line | A line drawn on a view where a cut was made in order to define the location of the imaginary section plane. |
| Interference | The amount of overlap that one part has with another when assembled. |
| Limit Dimensions | The largest and smallest possible boundaries to which a feature may be made as related to the tolerance of the dimension. |
| Part Drawing | A drawing that contains all the information for making one part of the design. |
| Section Lines | Thin lines used in a section view to indicate where the cutting plane line has cut through material. |
| Section View | A view that is used to show details not apparent on the exterior of the part. |
| Size Dimension | Placed directly on a feature to identify a specific size or may be connected to a feature in the form of a note. |
| Tolerance | The acceptable amount of dimensional variation that will still allow an object to function correctly. |
| Unidirectional Dimension | A dimensioning system which requires all numerals, figures, and notes to be lettered horizontally and to be read from the bottom of the drawing sheet. |
| Unilateral Tolerance | A tolerance in which variation is permitted in only one direction from the specified dimension. |
| Working Drawings | Drawings that convey all of the information needed to manufacture and assemble a design. |
