self-purification

noun
self-pu·ri·fi·ca·tion | \ˌself-ˌpyu̇r-ə-fə-ˈkā-shən, -ˌpyər-\

Definition of self-purification 

1 : purification by natural process self-purification of water

2 : purification of oneself

First Known Use of self-purification

1654, in the meaning defined at sense 2

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The first known use of self-purification was in 1654

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