A person who entertains an audience, for example by acting, singing, dancing, or playing music. The performer captivated the audience with her stunning vocal range.
A person who executes a task or action, especially one who does so with skill or competence. He is a top performer in the sales department, consistently exceeding his targets.
A person or thing that carries out a function or task, often with notable effectiveness. This laptop is a solid performer even under heavy workloads.