/ Dictionary / Index S septuagenarian: Meaning and Definition of Find definitions for: sep•tu•a•ge•nar•i•an Pronunciation: (sep"ch-u-ju-nâr'ē-un, -t-, -ty-), [key] — adj. of the age of 70 years or between 70 and 80 years old. —n. a septuagenarian person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: septuagenarian (Thesaurus) septivalent septuagenary Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language