Prologuize means to deliver a prologue or introductory speech. However, if you want to express the same idea with different words, there are several synonyms you can use. Some examples include preface, preamble, introduction, opening remarks, or initial address. These words all imply the act of starting or introducing something while setting the tone for the upcoming discussion or event. Other synonyms that convey a similar meaning include kickoff, curtain raiser, commencement, or initiation. Regardless of the word you choose, all synonyms for prologuize suggest the act of beginning in a formal or introductory manner.