- The art or research of descriptive drawing, especially through mechanical appliances and mathematical principles.
- The art or research of descriptive design; specifically, the art or technology of drawing by technical appliances and mathematical guideline.
- the skill of design or drawing.
- The art or science of descriptive drawing, particularly in the form of mechanical appliances and mathematical rules.
- The art or science of descriptive design; particularly, the art or science of drawing by technical devices and mathematical rule.
- the skill of design or design.