The term "perpetual" refers to something that lasts indefinitely or continues without interruption. It is often used to describe processes, conditions, or states that do not have a defined end. For example, a perpetual motion machine is a hypothetical device that can operate indefinitely without an external energy source, although such machines are impossible according to the laws of physics. In a broader context, "eternal" is synonymous with perpetual, often used in philosophical or spiritual discussions. Concepts like eternal life or eternal love suggest a state that transcends time, implying that these experiences or conditions exist forever, beyond the limitations of the physical world.