Col ‧ o ‧ ra ‧ do /ˌkɒləˈrɑːdəʊ◂ $ ˌkɑːləˈræ-/ BrE AmE ( written abbreviation CO )
a state in the western US, mostly in and around the Rocky Mountains. Its capital city is Denver, and other cities include Aspen, which is a well-known centre for skiing (↑ ski ), and Boulder. Colorado is a popular place for both winter and summer holidays.