1. To bring down the size, quantity, quality, value or intensity of something; to diminish, to lower, to impair.
  2. To lose weight.
  3. To bring to an inferior rank; to degrade, to demote.
  4. To humble; to conquer; to subdue; to capture.
  5. To bring to an inferior state or condition.
  6. To decrease the liquid content of food by boiling much of its water off.
  7. To add electrons / hydrogen or to remove oxygen.
  8. To produce metal from ore by removing nonmetallic elements in a smelter.
  9. To simplify an equation or formula without changing its value.
  10. To convert to written form (Usage note: this verb almost always take the phrase "to writing").
  11. To perform a reduction; to restore a fracture or dislocation to the correct alignment.

The above text is a snippet from Wiktionary: reduce
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