Dictionary
prot•a•sis
Pronunciation: (prot'u-sis), [key]—
n.,
—pl. -sesPronunciation: (-sēz"). [key]
1. the clause expressing the condition in a conditional sentence, in English usually beginning with
if. Cf.
apodosis.
2. the first part of an ancient drama, in which the characters are introduced and the subject is proposed. Cf.
catastasis, catastrophe (def. 4),
epitasis.
3. (in Aristotelian logic) a proposition, esp. one used as a premise in a syllogism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.