Dictionary.net

• 11th President of the United States; his expansionism led to the Mexican War and the annexation of California and much of the southwest (1795-1849)

2006 - WordNet 3.0
By Princeton University

• 11th President of the United States; his expansionism led to the Mexican War and the annexation of California and much of the southwest (1795-1849)

2011 - English Dictionary Database
By DataStellar Co., Ltd