Time worked beyond one's regular working hours, usually paid at a higher rate.
“Employees who work overtime this month will receive additional compensation.”
“The memo asked staff to avoid unnecessary overtime during the slow season.”
Workplace correspondence in Reading Part 1 sometimes discusses 'overtime' policies or requests. Pay attention to numbers, such as hours or pay rate, attached to this word, since Part 1 often tests specific factual details rather than just vocabulary meaning.
Synonyms: extra hours, additional hours