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Definition of RIO
1. Noun. The former capital and 2nd largest city of Brazil; chief Brazilian port; famous as a tourist attraction.
Exact synonyms: Rio De Janeiro
Generic synonyms: City, Metropolis, Urban Center
Group relationships: Brasil, Brazil, Federative Republic Of Brazil
Member holonyms: Carioca
Generic synonyms: City, Metropolis, Urban Center
Group relationships: Brasil, Brazil, Federative Republic Of Brazil
Member holonyms: Carioca
Definition of RIO
1. Acronym. (US military aviation) radar intercept officer ¹
2. Proper noun. (form of shortened form Rio de Janeiro) ¹
¹ Source: wiktionary.com