a village in central Belgium, south of Brussels: Napoleon decisively defeated here on June 18, 1815.
a decisive or crushing defeat: The candidate met her Waterloo in the national elections.
a city in E Iowa.
a city in SE Ontario, in S Canada.
a small town in central Belgium, in Walloon Brabant province south of Brussels: battle (1815) fought nearby in which British and Prussian forces under the Duke of Wellington and Blücher routed the French under Napoleon. Pop: 29 003 (2004 est)