American English

Definition of mole noun from the Oxford Advanced American Dictionary



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  1. 1a small dark brown mark on the skin, sometimes slightly higher than the skin around it compare freckle
  2. 2a small animal with dark gray fur, that is almost blind and digs tunnels under the ground to live in see also molehill
  3. 3a person who works within an organization and secretly passes important information to another organization or country
  4. 4(chemistry) a unit for measuring the chemical mass of a substance see also mole2

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