Costa Rica cos·ta·rica US/ˈkɔstʌˈrikʌ/ uncommon noun 1. a republic in Central America; one of the most politically stable countries in Latin America SynonymsCosta RicaRepublic of Costa Rica Related words Word family Costa RicanCosta Rican colonCosta Rican monetary unit Broader terms Central American country Parts Central AmericaOrganization of American States Part of San JoseCosta Rican WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.