noun Louis Ste·phen [lwee ste-fen] /lwi stɛˈfɛn/, 1882–1973, prime minister of Canada 1948–57. Yves (Ma·thieu) [eev-ma-tyœ] /iv maˈtyœ/, 1936–2008, French fashion designer. a city in S Quebec, in E Canada, W of Montreal.