Seventy/ˈsevnti/ Definition 1 of 1Pro Tip 1/3Numerical Range Used to express an approximate number, not always exact. There were seventy people at the party, give or take a few. Pro Tip 2/3Emphasis on Age 'Seventy' often highlights a significant age, implying wisdom or a long life. He shared the wisdom of his seventy years. Pro Tip 3/3Historical Context 'Seventy' can refer to a memorable decade in history, like the 1970s. Seventies music was truly revolutionary.