quarter-century
- n a period of 25 years
- The operation, conducted by CIA alchemists from 1954 until 1963, was part of a quarter-century hunt for a psychogenic philosophers' stone.
- But starting with a 1965 bill that did away with country-by-country quotas for immigrants, and especially in the quarter-century since his failed 1980 campaign for President .
- On that day, Goddard who would ultimately be hailed as the father of modern rocketry sank into a quarter-century sulk from which he never fully emerged.