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Hypothesis

Definition: A supposition; a proposition or principle which is
supposed or taken for granted, in order to draw a conclusion or
inference for proof of the point in question; something not proved, but
assumed for the purpose of argument, or to account for a fact or an
occurrence; as, the hypothesis that head winds detain an overdue
steamer.

Hypothesis

Definition: A tentative theory or supposition provisionally adopted
to explain certain facts, and to guide in the investigation of others;
hence, frequently called a working hypothesis.