/ Dictionary / Index C Commonwealth Day: Meaning and Definition of Find definitions for: Com'monwealth Day" Pronunciation: [key] a holiday observed in some countries of the Commonwealth of Nations, originally on May 24, the anniversary of Queen Victoria's birth, but now on varying dates. Formerly, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. commonwealth Commonwealth of England Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language