What term refers to the appreciation or concern with beauty?

The term that refers to the appreciation or concern with beauty is "Aesthetic." Aesthetics deals with the nature of beauty, art, and taste, as well as the creation and appreciation of beauty in various forms. In design and engineering, aesthetics is an essential aspect because it not only influences how a product is perceived by users but also affects user experience and overall satisfaction. Good aesthetic design can make a product more appealing, promote emotional connections, and enhance its usability in some cases.

The other terms listed relate to different concepts in design. Functionalism emphasizes the importance of a product's functionality and utility, often prioritizing practicality over appearance. Design, in a broader sense, encompasses both the aesthetic and functional elements of a product. Utility refers explicitly to the usefulness of a design, focusing on how well a product meets the needs of users rather than its beauty. Therefore, aesthetics capture the specific aspect of beauty and visual appeal in the context of design.