/ Dictionary / Index M midsummer: Meaning and Definition of Find definitions for: mid•sum•mer Pronunciation: (mid'sum'ur, -sum"-), [key] — n. the middle of summer. the summer solstice, around June 21. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: midsummer (Thesaurus) midstream Midsummer Day Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language