PREPARATORY
preparatory, preparative, propaedeutic
(adjective) preceding and preparing for something; “preparatory steps”
Source: WordNet® 3.1
Adjective
preparatory (not comparable)
Of or pertaining to preparation, having the purpose of making something or someone ready, preparative.
Source: Wiktionary
Pre*par"a*to*ry, a. Etym: [L. praeparatorius: cf. F. préparatoire.]
Definition: Preparing the way for anything by previous measures of
adaptation; antecedent and adapted to what follows; introductory;
preparative; as, a preparatory school; a preparatory condition.
Source: Webster’s Unabridged Dictionary 1913 Edition