preparative

adj

1. That serves to prepare something

   “preparative chromatography”

2. preliminary or preparatory

   “preparative discussions”

3. Pertaining to the synthesis, purification, or isolation of compounds from mixtures or raw materials.

noun

1. Something to be done in preparation; a preliminary

   “necessary preparatives for our voyage”

   “a preparative unto sermons”

   “All wars are boyish, and are fought by boys, / The champions and enthusiasts of the state: / Turbid ardors and vain joys / Not barrenly abate— / Stimulants to the power mature, / Preparatives of fate.”