a period of ten years., a decade, a period of one hundred years., a century, a very long period of one thousand years., a millennium, a period of twenty-five years., a quarter-century, a period of two weeks (fourteen days)., a fortnight, a long period of time that is known for special events or a certain style of life., an era, a long period in history, often named after an important idea, person, or development., an age, a group of people born around the same time, or the time (about 20–30 years) between parents and children., a generation.

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