A person who puts forward a proposal or suggestion. The proposer of the new policy presented his ideas at the meeting.
A person who nominates someone for a position, award, or honor. As the proposer, she was responsible for introducing the candidate to the committee.
In insurance, finance, or law, a person or organization that submits an application, offer, or bid, especially for a contract or policy. Before issuing the life policy, the insurer required the proposer to undergo a medical examination.