verb, -duced, -duc⋅ing.| 1. | to bring down to a smaller extent, size, amount, number, etc.: to reduce one's weight by 10 pounds. |
| 2. | to lower in degree, intensity, etc.: to reduce the speed of a car. |
| 3. | to bring down to a lower rank, dignity, etc.: a sergeant reduced to a corporal |
| 4. | to treat analytically, as a complex idea. |
| 5. | to lower in price. |
| 6. | to bring to a certain state, condition, arrangement, etc.: to reduce glass to powder. |
| 7. | to bring under control or authority. |
| 8. | Cookery. to evaporate water from (a sauce, soup, or other liquid), usually by boiling. |
| 9. | Photography. to lessen the density of (an exposed negative). |
| 10. | to adjust or correct by making allowances, as an astronomical observation. |
| 11. | Mathematics. to change the denomination or form, but not the value, of (a fraction, polynomial, etc.). |
| 12. | Chemistry.
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| 13. | Chemistry, Metallurgy. to bring into the metallic state by separating from nonmetallic constituents. |
| 14. | to thin or dilute: to reduce paint with oil or turpentine. |
| 15. | to lower the alcoholic concentration of (spirits) by diluting with water. |
| 16. | Surgery. to restore to the normal place, relation, or condition, as a fractured bone. |
| 17. | Phonetics. to modify the quality of (a speech sound) to one of lesser distinctiveness, esp. to pronounce (an unstressed vowel) as (ə) or another centralized vowel, as in the unstressed syllables of medicinal. |
| 18. | to become reduced. |
| 19. | to become lessened, esp. in weight. |
| 20. | to be turned into or made to equal something: All our difficulties reduce to financial problems. |
| 21. | Cell Biology. to undergo meiosis. |

re·duce (rĭ-dōōs', -dyōōs') v. re·duced, re·duc·ing, re·duc·es v. tr.
[Middle English reducen, to bring back, from Old French reducier, from Latin redūcere : re-, re- + dūcere, to lead; see deuk- in Indo-European roots.] re·duc'er n., re·duc'i·bil'i·ty n., re·duc'i·ble adj., re·duc'i·bly adv. |
reduce re·duce (rĭ-d&oomacr;s', -dy&oomacr;s')
v. re·duced, re·duc·ing, re·duc·es
To bring down, as in extent, amount, or degree; diminish.
To lose weight, as by dieting.
To restore a fractured or displaced body part to a normal condition or position.
To decrease the valence of an atom by adding electrons.
To remove oxygen from a compound.
To add hydrogen to a compound.