Definitions of proposition:

• noun:   a task to be dealt with

  Example: "Securing adequate funding is a time-consuming proposition"

• noun:   (logic) a statement that affirms or denies something and is either true or false
• noun:   an offer for a private bargain (especially a request for sexual favors)
• noun:   the act of making a proposal
• noun:   a proposal offered for acceptance or rejection
• verb:   suggest sex to

  Example: "She was propositioned by a stranger at the party"