scenario UK /sɪˈnɑːɹi.əʊ/US /sɪˈnɛəɹioʊ/ noun3 •a story of events that could happen, set out in the order they would come inHearts were keen to avoid a repeat of the scenario at this stage of last season's competition, when they found themselves two goals down inside the opening quarter of an hour. — 2012 •(old-fashioned) An outline of the plot of a dramatic or literary work. •(old-fashioned) A screenplay itself, or an outline or a treatment of it. formsscenari · scenaria · scenarii · scenarios