환원

〔還元〕

[화눤]

1. return; giving back; restoration
An act of going back to the original state; or an act of making this happen.

2. reduction
In philosophy, an act of changing miscellaneous things or phenomena into fundamental ones.

3. reduction
In chemistry, a phenomenon in which a substance mixed with oxygen loses the oxygen, or a substance combines with hydrogen, or certain atoms, molecules, ions, etc., acquire electrons.