1. A proposal intended to explain certain facts or observations (synset 107177196)
  2. A tentative insight into the natural world;
    A concept that is not yet verified but that if true would explain certain facts or phenomena (synset 105897536)
    "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
  3. A message expressing an opinion based on incomplete evidence (synset 106795537)

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