Proposal.
Synonyms:
bid, offer, overture, proposition.
An offer or proposal puts something before one for acceptance or rejection, proposal being the more formal word; a proposition sets forth truth (or what is claimed to be truth) in formal statement. The proposition is for consideration, the proposal for action; as, a proposition in geometry, a proposal of marriage; but proposition is often used nearly in the sense of proposal when it concerns a matter for deliberation; as, a proposition for the surrender of a fort. A bid is commercial and often verbal; as, a bid at an auction; proposal is used in nearly the same sense, but is more formal. An overture opens negotiation or conference, and the word is especially used of some movement toward reconciliation; as, overtures of peace.
Antonyms:
acceptance, denial, disapproval, refusal, rejection, repulse.