Answer: protasis

AnswerCrossword Clue
PROTASISOpening lines of a drama
protasisthe first part of an ancient drama, in which the characters are introduced and the subject is proposed
protasis(in Aristotelian logic) a proposition, esp. one used as a premise in a syllogism
protasisthe introductory part of a classical drama
protasisthe clause expressing the condition in a conditional sentence, in English usually beginning with if