Part of speech: noun

The act of theorizing; a theory.

Part of speech: noun

A more or less risky investment.

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Usage examples "speculation":

  1. " They should not," replied her father; " but as they invariably do, the speculation is one outside our immediate concern. - "Kai Lung's Golden Hours", Ernest Bramah Commentator: Hilaire Belloc.
  2. That was to say that one would make an addition of more than one pound a week to one's income by this simple little speculation. - "Mortal Coils", Aldous Huxley.
  3. But his speculation on this head was cut short. - "The Red Derelict", Bertram Mitford.