/ Dictionary / Index M Midsummer Day: Meaning and Definition of Find definitions for: Mid'summer Day' Pronunciation: [key] the saint's day of St. John the Baptist, celebrated on June 24, being one of the four quarter days in England. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. midsummer Midsummer Eve Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language