Etymology
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scenario (n.)

1868, "sketch of the plot of a dramatic work," from Italian scenario, from Late Latin scenarius "of stage scenes," from Latin scena "scene" (see scene); earlier in nativized form scenary (1690s). The meaning "imagined situation" is recorded by 1960, in reference to hypothetical nuclear wars.

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Definitions of scenario

scenario (n.)
an outline or synopsis of a play (or, by extension, of a literary work);
scenario (n.)
a setting for a work of art or literature;
the scenario is France during the Reign of Terror
scenario (n.)
a postulated sequence of possible events;
planners developed several scenarios in case of an attack
From wordnet.princeton.edu