What does the term "advent" signify?

The term "advent" signifies the arrival of something significant or awaited, particularly when it marks the beginning of an important event or period. This definition aligns with the idea of a significant arrival that is anticipated, which is why the correct choice is the one that captures this essence of expectation and importance.

The word is often used in various contexts, such as in religious references (like the Advent season leading up to Christmas), where it marks the awaited arrival of Christ. Thus, when "advent" is used, it evokes a sense of anticipation for something noteworthy that is about to happen or commence.

In contrast, the other choices do not accurately reflect the meaning of "advent." An unexpected occurrence, a sudden departure, or a gradual decline do not convey the sense of awaited arrival that is central to the definition of the term.