Westminster Syllabification: (West·min·ster)Pronunciation: /ˈwes(t)ˌminstər, ˌwes(t)ˈmin-/Definition of Westminster 1an industrial and commercial city in southwestern California, southeast of Los Angeles; population 88,975 (est. 2008). 2a city in north central Colorado, northwest of Denver; population 107,056 (est. 2008). 3an inner London borough that contains the Houses of Parliament and many government offices. Full name City of Westminster. used in reference to the British Parliament:Westminster enforced successive cuts in payWestminster in other Oxford dictionaries Definition of Westminster in the British & World English dictionary