Definition of Springfield
1the state capital of Illinois; population 117,352 (est. 2008). It was the home and burial place of Abraham Lincoln. 2a city in SW Massachusetts, on the Connecticut River; population 150,640 (est. 2008). It was first settled in 1636. 3a city in SW Missouri, on the northern edge of the Ozark Mountains; population 156,206 (est. 2008).