What is another word for "protasis"?

Roget's Thesaurus (1911) lists these synonyms for "protasis": adage, admitted, antecedent, aphorism, aphoristic, apophthegm, apothegm, assumption, avant-courier, axiom, axiomatic, belief, bellwether, byword, common, commonplace, conclusion, dawn, dictum, exordium, fact, faith, first, foreboding, forerunner, foreword, formula, frontispiece, gnomic, golden, groundwork, harbinger, heading, herald, idea, inaugural, introduction, introductory, judgment, leader.