postulator

/ˈpɑstʃəˌleɪtər/
noun
  1. A person who formally proposes or advocates for something, especially in a legal or religious context.
    • As the postulator of the new policy, she argued for its adoption at the meeting.
    • The postulator gathered evidence and testimonies to support the cause.
    • The postulator presented the case for the saint's canonization to the church officials.
  2. A person who assumes or asserts something as a basis for argument.
    • The philosopher was a postulator of the idea that reality is fundamentally mental.
    • The postulator claimed that the data supported his hypothesis, but others disagreed.
    • Every postulator of a new theory must be prepared to defend its assumptions.
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