speculation
US /ˌspek.jəˈleɪ.ʃən/
UK /ˌspek.jəˈleɪ.ʃən/
1.
the forming of a theory or conjecture without firm evidence
:
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His disappearance has led to much speculation.
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There was widespread speculation that he would resign.
2.
investment in stocks, property, or other ventures in the hope of gain but with the risk of loss
:
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He made his fortune through shrewd financial speculation.
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The real estate market is prone to periods of intense speculation.