Which term best encompasses the overall purpose of architectural design?

The overall purpose of architectural design is best captured by the concept of merging science with art in building. This option reflects how architecture is not merely about creating structures but also involves applying scientific principles, such as engineering and materials science, alongside creative aspects to enhance aesthetic appeal and functionality.

Architectural design requires a balance of technical knowledge and artistic vision; this integration allows for the creation of spaces that are not only usable and structurally sound but also visually inspiring and contextually relevant. The ability to innovate and create unique designs stems from understanding both the scientific and artistic dimensions of building.

While creating functional living spaces, maximizing space utilization, and reducing construction costs are important aspects of architectural design, they are specific objectives that fall under the broader goal of harmonizing scientific and artistic elements. Achieving these objectives often involves the very synthesis that defines architecture, making the answer focused on the fusion of science and art the most comprehensive representation of architectural design's purpose.