Final answer:
Proportion is the comparative relationship of one thing to another in hair design.
Step-by-step explanation:
In the context of hair design, the comparative relationship of one thing to another is called proportion. Proportion refers to the size relationship of different parts of a body or form to one another and to the whole.
For example, in hair design, the proportion of the size of the head in relation to the entire body plays a significant role in achieving a balanced and aesthetically pleasing result.