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speculation

speculation - noun

  1. The act or process of thinking: brainwork, cerebration, cogitation, contemplation, deliberation, excogitation, meditation, reflection, rumination, thought. See thoughts.
  2. A judgment, estimate, or opinion arrived at by guessing: conjecture, guess, guesswork, supposition, surmise. See opinion.
  3. Abstract reasoning: conjecture, theory. See belief. thoughts.
  4. A venture depending on chance: bet, gamble, risk, wager. See gambling.