The Collaborative International Dictionary of English v.0.48:

Prospectus \Pro*spec"tus\, n. [L., a prospect, sight, view: cf.
   F. prospectus. See Prospect.]
   A summary, plan, or scheme of something proposed, affording a
   prospect of its nature; especially, an exposition of the
   scheme of an unpublished literary work.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prospectus
    n 1: a formal written offer to sell securities (filed with the
         SEC) that sets forth a plan for a (proposed) business
         enterprise; "a prospectus should contain the facts that an
         investor needs to make an informed decision"
    2: a catalog listing the courses offered by a college or
       university [syn: course catalog, course catalogue,
       prospectus]