punctuationist Syllabification: (punc·tu·a·tion·ist)Pronunciation: /ˌpəNGkCHo͞oˈāSHənist/Definition of punctuationist noun Biology a person who believes in or advocates the hypothesis of punctuated equilibrium. Derivatives punctuationalismPronunciation: /-ˈāSHənlˌizəm/ noun punctuationalistPronunciation: /-ˈāSHənl-ist/ adjective punctuationismPronunciation: /-ˈāSHəˌnizəm/ noun punctuationist in other Oxford dictionaries Definition of punctuationist in the British & World English dictionary