Which term refers to a creative solution that has not previously existed?

The term that best describes a creative solution that has not previously existed is "invention." Invention specifically refers to the process of creating something entirely new, whether it’s a device, method, or process that did not exist before. This can encompass a wide range of ideas, from technological advancements to artistic creations, all rooted in the novelty of the concept or item.

While "innovation" is often associated with improving or adapting existing ideas or products, it does not necessarily imply that the creation is entirely new. "Modification" involves making changes to something that already exists, and "reinvention" refers to taking existing ideas or products and redefining or repurposing them in a new way. In contrast, invention signifies the birth of an entirely new concept or tool, which is why it aligns perfectly with the definition of a creative solution that has not been seen before.