IPA: /ˌpriːəˈsaɪnd/
KK: /priˈæsaɪnd/
Referring to something that has been given a specific role or task before it is needed or used.
The preassigned tasks were completed ahead of schedule.
Preassigned → It is formed from "pre-" (meaning before) and "assign" (from Latin "assignare", meaning to designate or allocate). The word "preassigned" means designated or allocated before a certain time or event.
Think of something that is 'designated' ('assign') 'before' ('pre-') it happens — that's what preassigned means.