OXFORD DICTIONARY
scenario, n. (pl. -os)
1 an outline of the plot of a play, film, opera, etc., with details of the scenes, situations, etc.
2 a postulated sequence of future events.
scenarist n. (in sense 1).
It. (as SCENA)
THESAURUS
scenario
book, continuity, cue, design, framework, game plan, layout, libretto, lines, outline, playbook, plot, precis, project, projection, proposal, proposition, prospectus, resume, routine, scene plot, schema, score, script, shooting script, side, structure, synopsis, text