1A river that rises in the Rocky Mountains of northern Colorado and flows southwest for 1,468 miles (2,333 km) to the Gulf of California. It passes through the Grand Canyon.
2A state in the central US; population 4,939,456 (est. 2008); capital, Denver. Colorado extends from the Great Plains in the east to the Rocky Mountains in the west. Part of it was acquired by the Louisiana Purchase in 1803 and the rest ceded by Mexico in 1848. It became the 38th state of the US in 1876.
3A river that flows east for 900 miles (1,450 km) across Texas, from the Llano Estacado to the Gulf of Mexico. Austin is situated on it.