Pronunciation: (wô'tur-lOO", wot'ur-, wô"tur-lOO', wot"ur-; for 1 also Flem. vä'tur-lō"),[key] —n. 1. a village in central Belgium, south of Brussels: Napoleon decisively defeated here on June 18, 1815.
2. a decisive or crushing defeat: The candidate met her Waterloo in the national elections. 3. a city in E Iowa. 75,985.
4. a city in SE Ontario, in S Canada. 49,428.