<p><strong>Noun</strong></p><ul><li>a proposition, or set of propositions, set forth as an explanation for the occurrence of some specified group of phenomena, either asserted merely as a provisional conjecture to guide investigation (working hypothesis) or accepted as highly probable in the light of established facts.</li><li>a proposition assumed as a premise in an argument.</li><li>the antecedent of a conditional proposition.</li><li>a mere assumption or guess.</li></ul>