The number equivalent to the product of seven and ten; 70. The thermostat is set at seventy degrees.
A set or group of seventy units or objects. The collection included a rare set of seventy stamps.
The decade of a person's life between ages 70 and 79. In his seventies, he took up painting as a new hobby.
The decade from 1970 to 1979, especially in the context of culture or history; the 1970s. Disco music became popular in the seventies.