Final answer:
The term for the concluding section of an aria is a coda, which serves as a lively and brilliant finale.
Step-by-step explanation:
The term for the lively and brilliant section that concludes an aria is Coda. An aria, which is typically found in operas, is a solo vocal piece with instrumental accompaniment that allows the singer to demonstrate their skill. The coda is often the culminating section of the aria, characterized by increased energy and a grand finale feeling, summarizing the musical themes and providing a memorable conclusion.