promulgate

/ˈprä-məl-ˌgāt/

Latin promulgatus, past participle of promulgare, from pro- forward + -mulgare (probably akin to mulgēre to milk, extract)

verb

  1. to make (an idea, belief, etc.) known to many people by open declaration : proclaim

  2. to make known or public the terms of (a proposed law)

  3. to put (a law or rule) into action or force

… the huge meeting served primarily as the occasion on which to promulgate the official doctrine …

declare announce proclaim promulgate mean to make known publicly. declare implies explicitness and usually formality in making known. announce implies the declaration of something for the first time.