preparatory
adj.
early 15c., from Late Latin praeparatorius, from Latin praeparatus (see preparation). Earlier in same sense was preparative (late 14c.). Applied from 1822 to junior schools in which pupils are "prepared" for a higher school.
〔李〕[prepar（ ←prepare）v. 准备；-atory ⇒“serving to prepare有助于准备的”→] a. for preparation，making ready；preliminary准备的，预备的；初步的