preparative

形容词 preparative:

1. preceding and preparing for something
   同义词：preparatory, propaedeutic

pre.par.a.tive

adj.（形容词）
Serving or tending to prepare or make ready; preliminary.
准备性的：用作或易于准备的；预备性的
n.（名词）
Something that prepares for or acts as a preliminary to something following.
预备：为随后的事作准备或作为其开端的事物

【引伸】
prepar.atively
adv.（副词）