the portion of act one in a play when the setting and characters are introduced
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Uses:
——From his first parley with the sentinel, to his leaving the city of Strasburg, after pulling off his crimson-sattin pair of breeches, is the Protasis or first entrance——where the characters of the Personæ Dramatis are just touched in, and the subject slightly begun.
Laurence Sterne. The Life and Opinions of Tristram Shandy, Gentleman (1759)
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It doubles itself in the middle of his life, reflects itself in another, repeats itself, protasis, epitasis, catastasis, catastrophe.
James Joyce. Ulysses
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Positing what protasis would the contraction for such several schemes become a natural and necessary apodosis?