Meaning

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

originEtymology tree Proto-Indo-European *(s)ḱeh₃-der. Ancient Greek σκηνή (skēnḗ)bor. Latin scēnabor. Italian scena Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -ārius Latin -āriumbor. Italian -ario Italian scenariobor. English scenario Borrowed from Italian scenario, from scena + -ario.

Etymology from Wiktionary, CC BY-SA 3.0