someone who assumes or takes something for granted as the basis of an argument
(Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization
The person who guides a Cause for beatification or canonization through the judicial processes required by the Roman Catholic Church is known as the postulator. The qualifications, role and function of the postulator are spelled out in the Norms to be Observed in Inquiries made by Bishops in the Causes of Saints effective since February?7, 1983.