ADULTERATION: to make food or drink weaker or to lower its quality, by adding something else.
1.Conternation:a feeling of worry,shock or confusion
2.Purification: to act of removing harmful substances from something
3.Normalization: ordinary or usual,the same as would be expected
4.Approximation: a guess of a number that is not exact but that is close
5.Rejuvenation: to process of making something more effective,modern and successful by using new ideas and methods.