1. a person who puts forward a proposal or theory
Usage: formal
2. in the Roman Catholic Church, an official who presents evidence for a person’s canonization or beatification
Usage: religious; Catholic Church

Examples

• The postulator presented compelling evidence for the saint’s miracles.
• As the main postulator of the theory, she defended it vigorously.
• The Vatican appointed a new postulator for the canonization process.
• Each postulator must gather extensive documentation for their case.
• The postulator argued that the candidate met all requirements for sainthood.
• He served as postulator for several beatification causes.