meliorism Syllabification: (mel·io·rism)Pronunciation: /ˈmēlēəˌrizəm/Definition of meliorism noun Philosophy the belief that the world can be made better by human effort. Derivatives meliorist noun & adjective melioristicPronunciation: /ˌmelēəˈristik/ adjective Origin: late 19th century: from Latin melior 'better' + -ismmeliorism in other Oxford dictionaries Definition of meliorism in the British & World English dictionary