Vis viva is a Latin term that refers to the concept of the kinetic energy of a moving body. It has been widely used in physics, mechanics, and engineering fields. There are several synonyms used to refer to vis viva, such as kinetic energy, mechanical energy, motion energy, and energy of motion. Kinetic energy is the most common synonym used in modern physics and mechanics. Mechanical energy is another synonym that refers to the energy possessed by an object due to its position or motion. Motion energy is used in some contexts to describe the energy of an object in motion. Energy of motion is a more descriptive term that defines the vis viva of a moving body.