Search Result for "postulator": 
Wordnet 3.0

NOUN (2)

1. (Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization;

2. someone who assumes or takes something for granted as the basis of an argument; 



WordNet (r) 3.0 (2006):

postulator
    n 1: (Roman Catholic Church) someone who proposes or pleads for
         a candidate for beatification or canonization
    2: someone who assumes or takes something for granted as the
       basis of an argument