Preparatory

(a.) Preparing the way; introductory; preparative; as, a preparatory school; a preparatory condition.

Thesaurus Entries

antecedent, anterior, basic, before, chief, elementary, essential, exordial, first, foremost, fundamental, headmost, in preparation for, inaugural, inductive, initiatory, introductory, leading, opening, precedent, preceding, precessional, precursory, prefatory, prelim, preliminary, preludial, prelusive, preparative, prerequisite, prevenient, primary, prior, proemial, propaedeutic, provident, provisional, rudimentary