The Collaborative International Dictionary of English v.0.48:
Determinist \De*ter"min*ist\, n. (Metaph.) One who believes in determinism. Also adj.; as, determinist theories. [1913 Webster]WordNet (r) 3.0 (2006):
determinist n 1: anyone who submits to the belief that they are powerless to change their destiny [syn: fatalist, determinist, predestinarian, predestinationist]