What term describes the overall shape or line design that forms the outline of a flower arrangement?

The term that best describes the overall shape or line design that forms the outline of a flower arrangement is "Form." In floral design, "Form" specifically refers to the three-dimensional shape of the arrangement as a whole, including how the various components interact to create a cohesive artistic expression. Understanding the concept of form is essential because it influences the visual balance and appeal of the design, guiding how the flowers and other materials are arranged to create specific shapes that can evoke different feelings or messages.

In floral arrangements, identifying the form helps designers consider how the arrangement will be viewed from different angles, ensuring that it is aesthetically pleasing from all perspectives. This foundational principle is crucial for creating effective and engaging floral designs, making "Form" the appropriate choice in this context.