The term 'maintain or prolong' can be summarized by the crossword solution 'SUSTAIN, ' which is a seven-letter word. Sustainability is an important concept in many areas, such as environmentalism, economics, and social justice. It refers to the ability of a system or process to continue over time without being depleted or damaged. In other words, it is the practice of preserving resources and maintaining balance in order to ensure that future generations will have access to the same resources.