Where does “meanwhile site” come from?

meanwhile site (English) comes from English site, from Middle English site, from Anglo-Norman site, from Latin situs, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “meanwhile site”, step by step

meanwhile site traces back through two separate lines of ancestry.

via English site

StepLanguageWordMeaning
1EnglishsiteSorrow, grief; The place where anything is fixed;...
2Middle Englishsitesorrow, grief
3Anglo-Normansitesite; location
4Latinsituspermitted, allowed, suffered, having been...
5Latin-tusForms the past participle of verbs; Forms...
6Proto-Italic-tus
7Proto-Indo-European-tusDerives action nouns from verb roots

via English meanwhile

StepLanguageWordMeaning
1EnglishmeanwhileThe time between two events; During the time that...
2Middle Englishmenewhile
Every word from Proto-Indo-European -tusEvery word from Latin -tusEvery word from Latin situs
meanwhile site — Etymology, Origin & Word History | Etymology Explorer