Define "harbinger."

The term "harbinger" refers to a person or thing that announces or signals the approach of another, especially something or someone significant. In this context, a harbinger serves as an indicator that something is on the way, often used in literature or discussions to foreshadow events or changes, such as an upcoming season or a notable transformation. This definition encapsulates the essence of the word and its usage in various contexts, highlighting its role as a precursor or herald of what is to follow.

The other definitions provided reflect a misunderstanding of the term. While chaos, bad news, and obstacles may be involved in various contexts, they do not capture the core meaning of "harbinger." The word is primarily associated with signaling or announcing rather than embodying negative connotations or hindrances.