IPA: /ˈpriːplæn/
KK: /priˈplæn/
To make arrangements or plans before an event or activity takes place.
We need to preplan our trip to ensure everything goes smoothly.
Past: preplanned
Past Participle: preplanned
Preplan → It is formed from "pre-" (meaning before) and "plan" (from Latin "planus", meaning flat or level, which evolved to mean a scheme or method). The word "preplan" means to create a plan before an event or action takes place.
Think of making a 'plan' ('plan') 'before' ('pre-') something happens — that's what preplan means.