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 for Hypotheses
From The Collaborative International Dictionary of English v.0.48 :

  Hypothesis \Hy*poth"e*sis\, n.; pl. Hypotheses. [NL., fr. Gr.
     ? foundation, supposition, fr. ? to place under, ? under + ?
     to put. See Hypo-, Thesis.]
     1. 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.
        [1913 Webster]
              An hypothesis being a mere supposition, there are no
              other limits to hypotheses than those of the human
              imagination.                          --J. S. Mill.
        [1913 Webster]
     2. (Natural Science) 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.
     Syn: Supposition; assumption. See Theory.
          [1913 Webster]
     Nebular hypothesis. See under Nebular. Hypothetic

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