monumental Syllabification: (mon·u·men·tal)Pronunciation: /ˌmänyəˈmentl/Translate monumental | into German | into Italian | into Spanish Definition of monumental adjective great in importance, extent, or size:it’s been a monumental effort the ballet came across as one of MacMillan’s most monumental works of or serving as a monument:additional details are found in monumental inscriptionsDerivatives monumentalism noun monumentalityPronunciation: /ˌmänyəˌmenˈtalətē/ noun monumentallyPronunciation: /-ˈmentl-ē/ adverb monumental in other Oxford dictionaries Definition of monumental in the British & World English dictionary