The addition of a fluoride to the water supply (to prevent dental decay)

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) The act or process of adding fluoride to something, especially water.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
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.

WordNet Word definitions in WordNet
n. the addition of a fluoride to the water supply (to prevent dental decay) [syn: fluoridization , fluoridisation ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
fluoridation \fluoridation\ n. The addition of a fluoride to the water supply (to prevent dental decay). Syn: fluoridization.