See also: waterloo
- (Received Pronunciation) IPA(key): /ˌwɔːtə(ɹ)ˈluː/
- (General American) IPA(key): /ˌwɔtɚˈluː/, /ˈwɔtɚˌluː/
- Rhymes: -uː
- Hyphenation: Wa‧ter‧loo
- A village in Walloon Brabant, Belgium; the site of a major military battle in 1815.
- A battle fought at Waterloo, Belgium on June 18, 1815, resulting in the epic, final defeat of Napoleon Bonaparte.
- A district and large railway terminus in central London, England.
- The name of any of several villages, towns, and cities around the world.
- A regional municipality and city in Ontario, Canada.
- A city, the county seat of Monroe County, Illinois, United States.
- A city, the county seat of Black Hawk County, Iowa, United States.
- A village and town, the county seat of Seneca County, New York, United States.
- A census-designated place in San Joaquin County, California, United States.
- A small village in Broadland district, Norfolk, England (OS grid ref TG2219). 
- A small village in South Norfolk district, Norfolk (OS grid ref TM1479). 
- A hamlet in Caerphilly county borough, Wales (OS grid ref ST1988).
- A suburb of Lower Hutt, New Zealand. 
- (battle): Battle of Waterloo
- (London) Bakerloo
city in Ontario, Canada
Waterloo (plural Waterloos)
- Often in the term meet one's Waterloo: a notable and decisive defeat following an encounter with a powerful opponent or a problem that is too difficult.
- 1903, O. Henry, Hygeia at the Solito:
- He flung his dime at a newsboy, got his Express, propped his back against the truck, and was at once rapt in the account of his Waterloo, as expanded by the ingenious press.
- 2003, Frank Mackey, Steamboat Connections: Montreal to Upper Canada, 1816–1843:
- Surprisingly, Greenfield did not meet his Waterloo in this showdown with his competitors.
- 2003, Craig B. Stanford, Upright: The Evolutionary Key to Becoming Human:
- The skull ended up as Dubois’ personal Waterloo. His work received nothing but rejection and derision throughout the next decade, and the bones became dark secrets for much of the early twentieth century, locked away in Dubois’ home, unavailable for study by other scholars.
- IPA(key): /ˈvaːtərˌloː/, [ˈvaːtɐˌloː], [ˈʋaː-]
- IPA(key): /ˈvɔːtərˌluː/, /ˈwɔː-/ (variant; due to belief that the name is English and/or influenced by the ABBA song)
Waterloo n (genitive Waterloos)
- Waterloo (village in Belgium)