1. 减少；降低
When there is a reduction in something, it is made smaller.

2. 减少；降低；缩小
Reduction is the act of making something smaller in size or amount, or less in degree.

1. the act of reducing complexity

Synonym: simplification

2. the act of decreasing or reducing something

Synonym: decreasediminutionstep-down

3. 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

Synonym: reducing