/ Dictionary / Index S Seventh-Day: Meaning and Definition of Find definitions for: Sev•enth-Day Pronunciation: (sev'unth-dā"), [key] — adj. designating certain Christian denominations that make Saturday their chief day of rest and religious observance: Seventh-Day Adventists. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seventh Commandment seventh heaven Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language