1. people who suggest or put forward ideas, plans, or courses of action
2. people who formally present proposals, especially in business or academic contexts
3. people who ask someone to marry them

Examples

• The committee reviewed applications from several proposers of the new policy.
• All proposers must submit their ideas by Friday.
• The proposers presented their business plan to the investors.
• She was one of the main proposers of the environmental initiative.
• The proposers waited nervously for the board’s decision.
• Many proposers choose romantic locations for their marriage proposals.
• The research grant attracted proposers from universities nationwide.