/sev"euhn tee/ , n. , pl. seventies , adj.
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.
adj.
6. amounting to 70 in number.
[ 1150-1200; ME; OE seofontig. See SEVEN, -TY 1 ]