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1. A message expressing an opinion based on incomplete evidence
   - guess, conjecture, supposition, surmise, surmisal, hypothesis
    
2. A hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)
   "speculations about the outcome of the election";
   - conjecture
    
3. An investment that is very risky but could yield great profits
   "he knew the stock was a speculation when he bought it";
   - venture
    
4. Continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature
   "the habit of speculation is the basis for all real knowledge";
   - meditation

Derived forms: speculations

Type of: contemplation, hypothesis, investment, investment funds, musing, opinion, possibility, reflection, reflexion [Brit], rumination, theory, thoughtfulness, view

Encyclopedia: Speculation