noun (n)

• something proposed (such as a plan or assumption)(noun.communication)

  source: wordnet30
• an offer of marriage(noun.communication)

  Synonym:
  marriage offer, marriage proposal, proposal of marriage
  

  source: wordnet30
• the act of making a proposal(noun.communication)

  Example:
  They listened to her proposal.
  

  Synonym:
  proposition
  

  source: wordnet30
• That which is proposed, or propounded for consideration or acceptance; a scheme or design; terms or conditions proposed; offer; as, to make proposals for a treaty of peace; to offer proposals for erecting a building; to make proposals of marriage.(noun)

  source: webster1913