dayroom in English dictionary dayroom Meanings and definitions of "dayroom" A common room in a barracks or dormitory intended for the inhabitants thereof to mingle in and socialize in. noun A common room in a barracks or dormitory where the inhabitants can mingle and socialize. more Grammar and declension of dayroom dayroom ( plural dayrooms) dayroom (plural dayrooms) more Sample sentences with "dayroom" Declension Stem Try again Available translations French German Hindi Hungarian Polish Russian Authors