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fluoridation (n.)

1904, "process of absorbing fluoride," from fluoride + -ation. In reference to adding traces of fluoride to drinking water as a public health policy, from 1949.

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Definitions of fluoridation

fluoridation (n.)
the addition of a fluoride to the water supply (to prevent dental decay);
Synonyms: fluoridization / fluoridisation
From wordnet.princeton.edu