IPA: /ˌpriːɪˈrɛktɪd/
KK: /priˈɛrɛktɪd/
Built or set up in advance before a specific time or event.
The preerected structures made the construction process much faster.
Preerected → It is formed from "pre-" (meaning before) and "erect" (from Latin "erectus", meaning to raise or build). The word "preerected" means something that has been built or raised beforehand.
Think of something that has been 'raised' ('erect') 'before' ('pre-') — that's what preerected means.