Preamble (noun) تمہید، دیباچہ، مقدمہ

a preliminary or preparatory statement; an introduction.
Example: “he could tell that what she said was by way of a preamble”
Synonyms: introduction, preliminaries, preface, lead-in, overture, prologue, foreword, prelude
Antonyms: close, termination, peroration, finale, conclusion
Conclave (noun) خفیہ مجلس، نجی اجتماع

a private meeting
Synonyms: (private) meeting, gathering, assembly, conference, convention, convocation, council
Antonyms: dispersal, disbandment, scission, vivisection