Meaning

verb state or announce

verb put a law into effect by formal declaration

originInherited from Middle English promulgaten, from Latin prōmulgātus, perfect passive participle of prōmulgō (“to make known, publish”), either from provulgō (“to make known, publish”), from pro (“forth”) + vulgō (“to publish”), or from mulgeō (“to bring forth”, literally “to milk”); see -ate (verb-forming suffix) and -ate (adjective-forming suffix). Doublet of promulge.

Etymology from Wiktionary, CC BY-SA 3.0