reduction

/rɪˈdʌkʃən/
noun
  1. The act of making something smaller or less in amount, size, or degree.
    • The doctor recommended a reduction in salt intake to improve her health.
    • The store announced a reduction in prices for the holiday sale.
    • There has been a significant reduction in pollution since the new law was passed.
  2. A chemical reaction in which a substance gains electrons.
    • In the battery, reduction occurs at the positive electrode.
    • Students learned about oxidation and reduction in chemistry class.
    • The reduction of iron ore produces pure iron metal.
  3. The process of simplifying or concentrating something, such as a liquid, by boiling or evaporation.
    • A reduction of the broth gives it a richer flavor.
    • The chef made a sauce reduction by simmering the stock for an hour.
    • She prepared a balsamic reduction to drizzle over the salad.
Synonyms