When referring to days on which businesses or organizations operate, the term "business day" is commonly used. However, there are several synonyms that can also be used interchangeably. The term "working day" is often used to refer to weekdays, excluding weekends and public holidays. Another synonym is "workday" which has a similar meaning to working day and refers to the period of time an employee spends at work. "Trading day" is a term commonly used in the financial industry and refers to the days where the stock market is open for trading. Lastly, "weekday" is a simple and commonly used synonym for the term business day.