Which term is best defined as the repeated use of the same product without processing it into new products?

The term that is best defined as the repeated use of the same product without processing it into new products is reusing. Reusing involves taking an item that has already been used and putting it back into service in its original form. This approach helps to extend the lifespan of products and reduces the need for creating new items, which in turn minimizes waste and conserves resources.

In contrast, recycling refers to the process of collecting and processing materials to make new products from them, thus requiring some form of transformation of the original item. Energy recovery involves converting waste materials into usable energy, which does not imply using the items in their original state. Lastly, disposal is the final step in managing waste, where items are discarded or thrown away and typically do not get reused or repurposed. Therefore, the definition of reusing distinctly highlights its focus on maintaining the original product's integrity while promoting sustainability practices.