Signification

1. To bring down the size, quantity, quality, value or intensity of something; to diminish, to lower.
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 express the solution of a problem in terms of another (known) algorithm.
11. To convert a syllogism to a clearer or simpler form.
12. To convert to written form. (Usage note: this verb almost always appears as "reduce to writing".)
13. To perform a reduction; to restore a fracture or dislocation to the correct alignment.
14. To reform a line or column from (a square).
15. To strike off the payroll.
16. To annul by legal means.
17. (obsolete) To translate (a book, document, etc.).