noun, plural sev·en·ties.
- a cardinal number, 10 times 7.
- a symbol for this number, as 70 or LXX.
- a set of this many persons or things.
- 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.
- the Seventy, the body of scholars who produced the Septuagint.
- amounting to 70 in number.
noun plural -ties
- the cardinal number that is the product of ten and sevenSee also number (def. 1)
- a numeral, 70, LXX, etc, representing this number
- (plural) the numbers 70–79, esp the 70th to the 79th year of a person’s life or of a particular century
- the amount or quantity that is seven times as big as ten
- something represented by, representing, or consisting of 70 units
- amounting to seventythe seventy varieties of fabric
- (as pronoun)to invite seventy to the wedding
n.1859 as the years of someone’s life between 70 and 79; from 1837 as the eighth decade of years in a given century. See seventy. Old English (hund)seofontig, from seofon (see seven) + -tig (see -ty (1)). Cf. Old Frisian soventich, Middle Dutch seventich, Old Norse sjau tiger.