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Definition of hypothesis:

  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.
  2. 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.

Synonyms:

theory, system, postulate, supposal, philosophy, presupposition, venture, antecedent, supposition, suggestion, deduction, shot in the dark, assignment, basis for discussion, tentative law, proposal, foundation, philosopheme, apriority, possible action, prediction, lemma, guesswork, surmisal, speculation, guess-so, demonstration, scheme, preliminary layout, shot, law, rationale, dead reckoning, interpretation, study at theory, derivation, attribution, starting point, clotheshorse, working hypothesis, condition, data, ground, guessing, surmise, guess, conjecture, tentative plans, possibility, term, possibleness, opening, thoughts, reason, meditation, explanation.

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