What is a day that the government designates as a holiday for the entire nation called?

The correct term for a day that the government designates as a holiday for the entire nation is known as a federal holiday. This designation is officially recognized by law and typically applies to all citizens, allowing for a day of recognition or celebration. Federal holidays often result in government offices being closed and may affect businesses and organizations in how they operate on those days.

In the United States, for instance, federal holidays include Independence Day and Thanksgiving. These holidays are established through legislation and often come with specific guidelines regarding paid time off for employees. It is important to recognize that while public holidays and other terms may convey similar ideas, the use of "federal holiday" specifies those that have been officially recognized and designated by federal law, highlighting their legal standing and uniformity across the nation.