A route across the central US, from the Missouri to Oregon, some 3,000 km (2,000 miles) in length. It was used chiefly in the 1840s by settlers moving west.
Definition of Oregon Trail in US English:
Oregon Trail
proper noun
A route across the central and western US used especially from 1840 until 1860 by settlers moving west. It extends about 2,000 miles (3,200 km) from Missouri to Oregon.