IPA: //priˈpɔːrʃənd//
KK: /priˈpɔrʃənd/
Divided into specific amounts before use.
The chef used preportioned ingredients to save time during meal preparation.
Preportioned → It is formed from "pre-" (meaning before) and "portion" (from Latin "portio", meaning a part or share) and the suffix "-ed" (indicating past action or condition). The word "preportioned" means something that has been divided into portions beforehand.
Think of something that has been divided into parts "before" ('pre-') it is used, which is what preportioned means.