(zenodo.org) Introduction Traditionally, time is considered the fourth dimension alongside spatial coordinates. However, its nature remains a subject of debate. This article proposes an alternative view in which a measurement must describe a specific physical characteristic. In this case, three fundamental dimensions remain: space, time, and mass. 1. Time as a Process Characteristic Time is not merely a sequence of events; it is the very creation of a wave. The wave itself is time, the wave is also size. The wave is size in time. The wave also inherently contains a third characteristic—the change in energy, or energy density. From the concept of a wave, three key characteristics emerge: space, time, and mass (energy density), which are inseparably linked through the law of conservation of energy. These three characteristics are fundamental as they are directly related to the very process of wave existence. As the wave propagates, it creates dimensionality, changes energy density, and defines the temporal characteristic of the process. While wave propagation occurs...