definition of
reduction

[1] #1 reduction n. [decrease, diminution, step-down] the act of decreasing or reducing something. wn

[2] #2 reduction n. [reducing] any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent. wn

[3] #3 reduction n. [simplification] the act of reducing complexity. wn