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speculation /ˌspɛkjəˈleɪʃən/  

  • noun
    plural -tions
    ideas or guesses about something that is not known [noncount]
    He dismissed their theories as mere speculation.
    The book is just a lot of idle speculation about the future.
    [noncount] :activity in which someone buys and sells things (such as stocks or pieces of property) in the hope of making a large profit but with the risk of a large loss
    He lost everything in foolish land speculation.