One of the mysteries of the English language finally explained.
Representation, campaigning, or support by a citizen advocate or group of citizen advocates; the function of a citizen advocate. Frequently attributive, as "citizen advocacy group", etc.
1960s; earliest use found in The Daily Review. From citizen + advocacy, after citizen advocate.
citizen advocacy/ˌsɪtɪz(ə)n ˈadvəkəsi/
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