Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prōmulgātĭo, ōnis, f. [promulgo], a making publicly known, a proclaiming, publishing, promulgation: leges nullā promulgatione latae, Cic. Phil. 1, 10, 25; 5, 3, 8; id. Fam. 1, 5, a, 2; id. Leg. 3, 19, 43.