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c.1600, from Middle French promulgation (14c.), from Latin promulgationem (nominative promulgatio) "a public announcement," noun of action from past participle stem of promulgare (see promulgate).
1520s, from Latin promulgatus, past participle of promulgare "make publicly known, propose openly, publish," perhaps altered from provulgare, from pro- "forth" (see pro-) + vulgare "make public, publish." Or the second element might be from mulgere "to milk" (see milk (n.)), used metaphorically for "cause to emerge." Related: Promulgated; promulgating. The earlier verb in English was promulge (late 15c.).