/ Dictionary / Index R Riga: Meaning and Definition of Find definitions for: Ri•ga Pronunciation: (rē'gu), [key] — n. a seaport in and the capital of Latvia, on the Gulf of Riga. 915,000. an arm of the Baltic between Latvia and Estonia. 90 mi. (145 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: riga (Thesaurus) rig rigadoon Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language