re·duc·tion (rĭ-dŭkˈshən)

1. The act, process, or result of reducing.
2. The amount by which something is lessened or diminished.
3. Restoration of an injured or dislocated part to its normal anatomical relation by surgery or manipulation.
4. The first meiotic division, in which the chromosome number is reduced. Also called reduction division, reduction of chromosomes.
5. A decrease in positive valence or an increase in negative valence by the gaining of electrons.
6. A reaction in which hydrogen is combined with a compound.
7. A reaction in which oxygen is removed from a compound.

Related Forms:

• re·ducˈtion·al adjective