The 17th century began a period now called the Enlightenment during which people asked more questions about the way the world worked.

The period between exposure and a positive blood test is called a "window."

Another period of silence will be called at the meal's end.

The period, called '3 years and 8 months' halted the economy.

There have always been celebrations in northern countries during the period now called Christmas week.

He wrote a book about this period called Morphine, which was finally released in 1926.

This period was called the "dead horse" time, and it usually lasted a month or two.

The period from about 1971 to 1976 is sometimes called the first generation of microcomputers.

Each period that the rocks remain hot is called an endurance.

The period during which the House meets to conduct its business is called a session.