—n. 1. a cardinal number, 10 times 7.
2. a symbol for this number, as 70 or LXX.
3. a set of this many persons or things.
4. seventies,the numbers, years, degrees, or the like from 70 through 79, as in referring to numbered streets, indicating the years of a lifetime or of a century, or referring to degrees of temperature: They live in the Seventies. His uncle is in his early seventies. It was in the seventies yesterday. 5. the Seventy,the body of scholars who produced the Septuagint.