What term refers to the concluding section of an oration?

The term that refers to the concluding section of an oration is "peroration." In rhetorical terms, a peroration serves as the final appeal of a speech, summarizing the main points and reinforcing the speaker's arguments. This part typically aims to persuade the audience and leave a lasting impression, often invoking a sense of urgency or emotional resonance.

The other options do not pertain to the structure of a speech: "pillory" refers to a device used for punishing offenders, "petrichor" describes the pleasant smell that accompanies the first rain after a dry spell, and "phlegmatic" denotes a person who is calm and composed, often implying a lack of emotion or response. Each of these terms belongs to entirely different contexts, making "peroration" the only correct choice that aligns specifically with concluding a speech.