The phrase "quarter-century" refers to a period of twenty-five years. There are several other synonyms that can be used to convey this meaning, including "twenty-five-year period," "25-year epoch," "a quarter of a century," and "two and a half decades." Another popular phrase used to describe this time frame is "silver jubilee," which is commonly used to celebrate a 25th anniversary. Additionally, some people may also use the term "twenty-five years ago" to reference events that occurred a quarter-century ago. No matter which phrase is used, each synonym serves as a useful way to communicate the length of time that has passed over the preceding twenty-five years.