introductory Synonyms

prefatory basic prefatorial preparatory prevenient forerunning primary primeval primogenial prior preparative prelusive preludious preludial preliminary preexistent precursory precursive preceding prodromal proemial propaedeutic untapped underivative prolegomenous prodromic pretrial premedical pre-existent ahead of aforeknown prelim vestigial tuitionary supra starting rudimentary rudimental propaedeutical preambulatory original foregoing first-hand first fetal exploratory exordial epagogic embryonic elementary