scenario

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An expected or supposed situation or sequence of events.
• noun An outline of the plot of a dramatic or literary work.
• noun An outline for a screenplay.
• noun A treatment for a screenplay.
• noun A screenplay.

from The Century Dictionary.

• noun A skeleton libretto of a dramatic work, giving the general movement of the plot and the successive appearances of the principal characters.
• noun The plot itself of such a work.

from the GNU version of the Collaborative International Dictionary of English.

• noun A preliminary sketch of the plot, or main incidents, of an opera.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An outline of the plot of a dramatic or literary work.
• noun A screenplay itself, or an outline or a treatment of it.
• noun An outline or model of an expected or supposed sequence of events.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an outline or synopsis of a play (or, by extension, of a literary work)
• noun a setting for a work of art or literature
• noun a postulated sequence of possible events