Mistaken spelling or dialectal variation of 'correlated'; established a mutual relationship or connection between things.
A misspelling or variant of correlated, possibly due to the doubling of L in English spelling conventions (which sometimes happens with -ed endings). Not standard modern English.
This is basically what happens when spell-check gets tricky—'correllated' with two L's keeps appearing in old documents and informal writing, even though 'correlated' is the correct version.
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