The territory sold by France to the US in 1803, comprising the western part of the Mississippi valley and including the modern state of Louisiana.
路易斯安那购置地（1803年法国卖给美国的领土，位于密西西比河流域的西部，包括现在的路易斯安那州）
Definition of Louisiana Purchase in US English:
Louisiana Purchase
proper noun
The territory sold by France to the US in 1803, comprising the western part of the Mississippi valley and including the modern state of Louisiana. The area had been explored by France, ceded to Spain in 1762, and returned to France in 1800.