The term 'era-defining' can be summarized as an EPOCHAL event or period of time that has a lasting impact on the future. An EPOCHAL event is one that marks a significant change in the course of history, and it is often seen as a turning point in the development of a culture or society. Examples of EPOCHAL events include the fall of the Berlin Wall, the invention of the internet, and the end of World War II. These events have had a lasting impact on the world and have shaped the way we live today.