GNU Collaborative International Dictionary of English

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  1.       
    
    Hypothesis , 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.

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