/ Dictionary / Index Q quiet sun: Meaning and Definition of Find definitions for: qui'et sun' Pronunciation: [key] — Astron. Astron. the sun at the minimum of solar activity, occurring every 11 years. the unchanging background of solar phenomena. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quietism quietude 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